Matsuo, Fukuoka
Akira Matsuo, Fukuoka JP
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20140017114 | TUNGSTEN CATHODE MATERIAL - Provided is a cathode material which becomes an alternative material of a cathode material formed of a W—ThO | 01-16-2014 |
Hideyuki Matsuo, Fukuoka JP
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20150148027 | CORDLESS TELEPHONE APPARATUS AND CONTROL METHOD OF THE SAME - A cordless telephone apparatus comprises a portable handset and a base station. The base station including a first wireless communication unit which, in operation, communicates data with a music player, a first control unit which, in operation, monitors a status of the music player and remotely controls the music player via the first wireless communication unit, a speaker which outputs audio data, an audio processing unit which, in operation, reproduces the audio data received by the first wireless communication unit from the music player and outputs the audio data to the speaker, a second wireless communication unit which wirelessly communicates data with the portable handset; and a second control unit which, in operation, controls the portable handset as an operation unit to remotely control the music player. | 05-28-2015 |
Kazunori Matsuo, Fukuoka JP
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20140255071 | IMAGE FORMING APPARATUS - Disclosed is an image forming apparatus that forms an image on one side of a sheet and then forms an image on the other side of the sheet. A single-sided sheet passing path transports a sheet housed in a sheet-feeding tray to the image forming section, and a double-sided sheet passing path reverses a sheet with an image formed on one side and causes the sheet to join the single-sided sheet passing path. The single-sided sheet passing path is formed so as to include a second interval which includes a registration sensor placed near a joining position of the single-sided and double-sided sheet passing paths in the double-sided sheet passing path as one end point and in which a sheet draws a moving trajectory substantially identical to a moving trajectory of a sheet in a first interval extending toward an upstream side in the transport direction of the sheet. | 09-11-2014 |
20140255072 | IMAGE FORMING APPARATUS - Disclosed is an image forming apparatus including: an ejection section including an ejection roller to eject a sheet from a first sheet passing path to a sheet ejection port and a reverse roller to reverse a transport direction of a sheet transported along a second sheet passing path, the ejection roller and the reverse roller being placed close to each other and close to the sheet ejection port; and a switching lever switches the transport destination of the sheet between the first and the second sheet passing paths for transporting the sheet to the ejection roller and to the reverse roller, respectively. A moving trajectory of a sheet transported along the first sheet passing path between the ejection roller and the switching lever is substantially identical to a moving trajectory of a sheet transported along the second sheet passing path between the reverse roller and the switching lever. | 09-11-2014 |
20150030365 | IMAGE FORMING APPARATUS - Disclosed is an image forming apparatus capable of preventing a paper jam in an arc-shaped sheet passing path for turning around a sheet and transporting the sheet in a double-sided transporting path. In this apparatus, a double-sided sheet passing path is formed so as to include: an arc-shaped interval that causes the sheet to turn around and to be transported to a registration sensor on an upstream side in the transport direction of a sheet and that includes the registration sensor as one end point; and an interval that transports the sheet having passed between ADU transport rollers, obliquely downward. A single-sided sheet passing path is formed so as to include an interval that transports the sheet having passed over the registration sensor in a substantially horizontal direction. | 01-29-2015 |
Kazushige Matsuo, Fukuoka JP
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20160054376 | WIRING CORE STRUCTURE, SEMICONDUCTOR EVALUATION DEVICE AND SEMICONDUCTOR DEVICE - A wound wire is wound around a core assembly so that both ends are short-circuited. In a coupling pin insertion state in which a coupling pin is inserted in a through hole of the core assembly, outer-peripheral space parts of respective divided core portions of the core assembly are disposed so as to overlap in plan view. Consequently, an air gap is formed in a part of a side surface of the core assembly. Before formation of a covering member, a main wire is caused to pass through the air gap and is thus disposed in a wiring hole of the core assembly. Then, the covering member for closing the air gap is provided on an outer peripheral surface side of the core assembly including the air gap so that a core structure is obtained. | 02-25-2016 |
Kumiko Matsuo, Fukuoka JP
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20130136059 | WIRELESS COMMUNICATION APPARATUS , WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION METHOD - A wireless communication system includes a first wireless communication apparatus, a second wireless communication apparatus, and a third wireless communication apparatus which operates as a control station of controlling the first and second wireless communication apparatuses. The third wireless communication apparatus receives data from the first wireless communication apparatus using a first slot, and sends the received data to the second wireless communication apparatus and an acknowledgment of reception of the data to the first wireless communication apparatus using a second slot. | 05-30-2013 |
Masakatsu Matsuo, Fukuoka JP
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20090271632 | SECRET AUTHENTICATION SYSTEM - Authentication data indicating authenticity of a client is distributed into a plurality of function data as distributed data, the plurality of function data including function data specifying a function and rule data specifying the authentication data from the function. The client and a server shares a portion of the plurality of function data. The client calculates verification data from the function data unshared with the server, by performing a calculation process difficult for a third party to calculate the function data, and transmits the verification data to the server. The server verifies authenticity of the client based on the authentication data and distributed data per client stored therein, and the verification data received from the client. | 10-29-2009 |
20090276621 | SECRET AUTHENTICATION SYSTEM - An authenticated apparatus generates scrambled data from key data and authentication data, such that another key data, which configures the product data, or authentication data is obtained through back-calculation of the product data by using the authentication data or key data, the scrambled data including the product data and the like generated by multiplying the authentication data indicative of the authenticated apparatus's or a user's authenticity by the key data. The authenticated apparatus generates verification data through an operation of the authentication data, key data, or scrambled data, and transmits the verification data and scrambled data to an authenticating apparatus. The authenticating apparatus then verifies authenticity of the authenticated apparatus based on the verification data and scrambled data received from the authenticated apparatus and each authenticated apparatus's or each user's authentication data stored in the authenticating apparatus. | 11-05-2009 |
20090276622 | SECRET AUTHENTICATION SYSTEM - Authentication data is distributedly defined by a plurality of distributed data, including function data specifying a function. A portion of the distributed data is shared between an authenticated apparatus and an authenticating apparatus. The authenticated apparatus obtains verification data from the distributed data unshared with the authenticated apparatus, and transmits the verification data. The authenticating apparatus verifies authenticity of the authenticated apparatus, based on the verification data and the like received from the authenticated apparatus. The authenticated apparatus generates the distributed data containing predetermined control data, and transmits the distributed data to the authenticating apparatus. The authenticating apparatus extracts the control data from the distributed data containing the control data, and determines whether or not authentication is granted based on the control data. | 11-05-2009 |
20090285389 | ELECTRONIC CERTIFICATION SYSTEM AND CONFIDENTIAL COMMUNICATION SYSTEM - A first apparatus as a requester is configured to encrypt random number data by using a public key of a second apparatus as a certificate issuer; to perform a calculation that multiples original data by the obtained encrypted random number data; and to deliver the obtained random number scrambled original data to the second apparatus. The second apparatus is configured to perform a calculation that multiples the random number scrambled original data by certified item data; to encrypt the obtained random number scrambled original data having the certified item, using a private key of the second apparatus; and to issue the obtained certificate data to one of the first apparatus and another apparatus that performs verification. | 11-19-2009 |
20090307495 | CONFIDENTIAL COMMUNICATION METHOD - In SSL encryption communication in which a client and a server share a password, the client generates random number data, encrypts the random number data with a public key and a password, and transmits the encrypted random number data to the server, so that the client and the server safely share the random number data having a bit length longer than that of the password. Safe cryptographic communication is performed without intermediaries by using the random number data or by mutually presenting a hash value of the random number data. | 12-10-2009 |
20120183139 | ENCRYPTION APPARATUS, DECRYPTION APPARATUS, ENCRYPTION METHOD, DECRYPTION METHOD, AND ENCRYPTION/DECRYPTION SYSTEM - In order to protect SSL encrypted communication from MITM attacks, a server certificate is used in the communication. However, operation of the server certificate is not simple, and the certificate is not sufficient to protect the communication from the MITM attacks. In SSL encrypted communication in which a password is shared between a client and a server, the client encrypts random number data and a password by means of a public key, determines a value by processing encrypted data by means of encrypted password data, and transfers the thus-determined value to the server. The server eliminates the password encrypted data from the value and back calculates the random number data, which are then decrypted, to thus acquire the random number data generated by the client. A hash value of the random number data is submitted to the client. | 07-19-2012 |
20120201383 | DECRYPTING APPARATUS, ENCRYPTING APPARATUS, DECRYPTING METHOD, ENCRYPTING METHOD, AND COMMUNICATION SYSTEM - A decrypting apparatus for decrypting cryptography data included in a packet includes a receiver, a key generator, and a decrypting section. The receiver receives a packet transmitted from an encrypting apparatus that executes an encrypting process. The key generator generates a key used for the encrypting process. The decrypting section decrypts cryptography data included in the packet received by the receiver with using the key generated by the key generator. In the decrypting apparatus, the packet received by the receiver includes packet information used for generating the key. The key generator generates the key with using the packet information. | 08-09-2012 |
20120250866 | COMMUNICATION APPARATUS AND COMMUNICATION SYSTEM - A communication apparatus communicates with another communication apparatus by using a first key. The communication apparatus includes a processing unit that conducts a handshake process for a key exchange with the another communication apparatus and a key encryption unit that conducts an encryption process by using a second key. The processing unit conducts a first handshake process with the another communication apparatus without exchanging information on the first key while serving as a reception side of key information. Then, the processing unit conducts a second handshake process with the another communication apparatus to transmit the information on the first key encrypted by the key encryption unit by using the second key to the another communication apparatus. | 10-04-2012 |
20120255030 | SECRET SHARING APPARATUS, SHARING APPARATUS AND SECRET SHARING METHOD - A secret sharing apparatus generates, from secret data, a plurality of pieces of shared data from which the secret data is able to be restored. The secret data includes a plurality of pieces of divided data which does not include a random number. The secret sharing apparatus includes a shared data generating section which performs an XOR operation between the pieces of divided data and generates the plurality of pieces of shared data which includes the result of the XOR operation between the pieces of divided data. | 10-04-2012 |
20120275601 | CRYPTOGRAPHIC COMMUNICATION APPARATUS AND CRYPTOGRAPHIC COMMUNICATION SYSTEM - There is provided a cryptographic communication apparatus for conducting a key exchange procedure with another cryptographic communication apparatus that shares a password. The apparatus includes a first encryption unit that encrypts information that is based on a first random number using a public key of the another apparatus, a second encryption unit that encrypts the information that is based on the first random number encrypted by the first encryption unit using the password, a third encryption unit that encrypts information that is based on a second random number using the first random number, and transmits a first signal and a second signal to the another apparatus, the first signal including the information that is based on the first random number encrypted by the second encryption unit, and the second signal including information that is based on the second random number encrypted by the third encryption unit. | 11-01-2012 |
20130282782 | DISTRIBUTION APPARATUS, RESTORATION APPARATUS, DISTRIBUTION METHOD, RESTORATION METHOD, AND DISTRIBUTION AND RESTORATION SYSTEM - Processing for generating a plurality of pieces of distributed data from original data or processing for restoring original data from a plurality of pieces of distributed data is performed safely and quickly. A distribution and restoration apparatus | 10-24-2013 |
20140173270 | SECRET SHARING METHOD AND SYSTEM - In a secret sharing process based on an improved threshold scheme, secret data is shared as shared data parts equal to or greater than a threshold value in number such that the secret data cannot be reconstructed from shared data parts less than the threshold value in number. Each of the shared data pieces is created essentially from a different combination of the secret data pieces and the data pieces for secret sharing computation. The secret sharing process allows an algorithm desired by the user to be freely incorporated, and can prevent the secret data to be easily reconstructed even when more shared data parts than the threshold value are acquired by a third party. | 06-19-2014 |
20140307090 | COMMUNICATION SYSTEM, COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A communication system includes a first communication apparatus and a second communication apparatus. The first communication apparatus includes a partial image data generation unit, configured to generate partial image data which is obtained by extracting a partial component from image data, and a transmission unit, configured to transmit the partial image data generated by the partial image data generation unit to the second communication apparatus. The second communication apparatus includes a reception unit, configured to receive the partial image data transmitted by the transmission unit of the first communication apparatus. | 10-16-2014 |
20150195280 | AUTHENTICATION SYSTEM AND AUTHENTICATION METHOD - Provided is an authentication system in which a client terminal that receives input of request information is connected to a server that executes a process with regard to the request information. The client terminal includes: a first authentication information generation unit that generates first authentication information based on information which is shared with the server; an encryption unit that generates encryption information; and a transmission unit that transmits the request information and encryption information to the server. The server includes: a reception unit that receives the request information and encryption information; a second authentication information generation unit that generates second authentication information; a decoding unit that generates reference information which is acquired by decoding the encryption information using the same common key method as in the client terminal while using the second authentication information as a key; and an authentication unit that compares the request information with the reference information. | 07-09-2015 |
20150341178 | CERTIFICATE ISSUING SYSTEM, CLIENT TERMINAL, SERVER DEVICE, CERTIFICATE ACQUISITION METHOD, AND CERTIFICATE ISSUING METHOD - Provided is a certificate issuing system including a client terminal and a server device. The client terminal derives a first hash value from a first random number using a unidirectional function, generates a secret key and a public key of the client terminal, and transmits the first hash value and the public key of the client terminal to the server device. The server device receives the first hash value and the public key of the client terminal from the client terminal, stores the first hash value, authenticates the client terminal on the basis of the stored first hash value and the derived first hash value, generates a client certificate on the basis of the public key of the client terminal and a secret key of the server device when the authentication succeeds, and transmits the client certificate to the client terminal. | 11-26-2015 |
20150350196 | TERMINAL AUTHENTICATION SYSTEM, SERVER DEVICE, AND TERMINAL AUTHENTICATION METHOD - Provided is a terminal authentication system including a client terminal and a server device. The client terminal transmits first information based on secret information different for each client terminal and a client certificate including a hash value of the secret information which is derived from the secret information, to a server device. The server device receives the first information and the client certificate, derives a hash value from the secret information based on the first information using a unidirectional function, and authenticates the client terminal on the basis of the derived hash value and the hash value of the secret information which is included in the client certificate. | 12-03-2015 |
20150350197 | SIGNATURE VERIFICATION SYSTEM, COMMUNICATION DEVICE, VERIFICATION DEVICE, SIGNATURE GENERATION METHOD, AND SIGNATURE VERFICATION METHOD - Provided is a signature verification system including a communication device and a verification device. The communication device and the verification device are connected to each other through a network. The communication device derives a first hash value from a first random number, derives a second hash value from data including electronic data and a certificate of the communication device which includes the first hash value and a public key of the communication device, using a unidirectional function, generates a signature using a secret key of the communication device with respect to the second hash value, and transmits the electronic data, the certificate, and the signature to the verification device. The verification device receives the electronic data, the certificate, and the signature, authenticates the communication device using the first hash value included in the certificate, derives the second hash value from the data including the electronic data and the certificate using a unidirectional function, and verifies the signature using the public key of the communication device and the derived second hash value which are included in the certificate. | 12-03-2015 |
Masatoshi Matsuo, Fukuoka JP
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20100013930 | VIDEO DISPLAY APPARATUS AND VIDEO DISPLAY METHOD - A video display apparatus for displaying on a monitor videos captured using capturing sections is provided. The capturing sections ( | 01-21-2010 |
20140313309 | DROWSINESS ESTIMATION DEVICE, DROWSINESS ESTIMATION METHOD, AND COMPUTER-READABLE NON-TRANSIENT RECORDING MEDIUM - A drowsiness estimation device comprises an imaging unit | 10-23-2014 |
Mitsuaki Matsuo, Fukuoka JP
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20100209225 | SUBSTRATE TRANSFER ROBOT, SUBSTRATE TRANSFER DEVICE, SEMICONDUCTOR MANUFACTURING APPARATUS, AND METHOD FOR PRODUCING SEMICONDUCTOR - A substrate transfer robot includes a substrate gripping portion, an arm unit, and a controller. The substrate gripping portion is configured to hold a substrate. The arm unit includes a plurality of arms which are capable of turning in a horizontal plane. The arm unit has the substrate gripping portion at a leading end of the arm unit and is configured to transfer the substrate between a plurality of taught positions taught beforehand. When the taught positions are taught, the controller is configured to generate an access standby position corresponding to each of the plurality of taught positions and configured to generate and store a plurality of routes from the access standby position to a minimum turning posture of the substrate transfer robot. | 08-19-2010 |
Naoto Matsuo, Fukuoka JP
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20090028617 | FIXING APPARATUS, HEATING ROLLER, AND IMAGE FORMING DEVICE - There is provided a fixing apparatus capable of reducing the warm-up time, improving the heating efficiency, and suppressing the temperature increase out of the sheet width by using a magnetic adjuster. In this apparatus, the Currie temperature Tc of the magnetic adjuster material heated by electromagnetic induction is set to 220 degrees C. or below and the fixation setting temperature of a heating member corresponding to the portion where a recording material passes during continuous sheet feed is set lower than a value than the temperature at which the relative magnetic permeability of the magnetic adjuster material begins to decrease. Thus, it is possible to obtain a large difference between the heating portion and the non-heating portion, to surely prevent excessive temperature increase of the portion out of the recording material width, to reduce the warm-up time, and improve the heating efficiency. | 01-29-2009 |
20100258797 | ORGANIC ELECTROLUMINESCENT DEVICE AND METHOD FOR MANUFACTURING THE SAME - An organic electroluminescent device is provided, including at least one light emitting layer | 10-14-2010 |
Ryou Matsuo, Fukuoka JP
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20130299749 | COMPOSITE CERAMIC BODY, AND COMPONENT MEMBER FOR SEMICONDUCTOR MANUFACTURING APPARATUS - A composite ceramic body which includes three phases consisting of a MgO phase, a YAP (YAlO | 11-14-2013 |
Seiichi Matsuo, Fukuoka JP
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20080309260 | Shaft Type Linear Motor, Mounting Head and Component Mounting Device With the Linear Motor, and Position Detection Method for Shaft for Driving the Linear Motor - A shaft type linear motor including a stator in which plural hollow cylindrical coils are disposed so that the center through holes thereof are arranged linearly so as to form a shaft insertion hole; a driving shaft including permanent magnets, the same magnetic poles, the north or south magnetic poles, being disposed in the axial direction so as to be opposed to each other, and movably inserted into the stator; sensor units disposed in the axial direction of the stator so as to have a predetermined clearance therebetween and equipped with plural magnetic pole detection sensors that detect the magnetic field intensities of the permanent magnets and output magnetic field intensity signals; and a detection section for receiving the magnetic field intensity signals output from the magnetic pole detection sensors and for detecting the position of the driving shaft on the basis of the plural magnetic field intensity signals. | 12-18-2008 |
Shigenori Matsuo, Fukuoka JP
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20140117999 | FAULT DIAGNOSIS SYSTEM, FAULT DIAGNOSIS DEVICE, FAULT DIAGNOSIS METHOD, PROGRAM, COMPUTER-READABLE MEDIUM, AND DEVICE UNDER TEST - A fault diagnosis method utilizing a fault diagnosis system for diagnosing a photovoltaic module by estimating a fault location, the fault diagnosis system including a signal generator for generating and inputting an input signal into a positive terminal or a negative terminal of the photovoltaic module, a waveform observer for observing a reflected output signal from an open end or the fault location, a diagnosis unit for estimating the fault location based on the output signal, a conductive body, and an alignment unit for controlling the positions of the conductive body and/or the photovoltaic module. The diagnosis method includes controlling the positions of the conductive body and/or the photovoltaic module, observing the output signal of the input signal, and estimating the fault location based on two reflected output signals of input signals inputted into the positive terminal and the negative terminal of the photovoltaic module. | 05-01-2014 |
Shinji Matsuo, Fukuoka JP
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20080255361 | Process for Producing Ortho-Metalated Complex of Iridium With Homoligand - Disclosed is a process for producing an ortho-metalated 1:3 complex of iridium with homoligands which is useful as a luminous material for an organic EL device in high yield at high purity in a short time by a simple procedure. An example of the complex is tris(2-phenylpyridine)iridium(III) and this complex can be produced by reacting iridium(III) acetylacetonate with an organic ligand consisting of 2-phenylpyridine in the copresence of an acidic substance, either an organic acid such as tartaric acid or an inorganic acid such as phosphoric acid. | 10-16-2008 |
20090130297 | Organic EL Material, Organic EL Device Using the Same, and Method for Producing Organic EL Device - Disclosed are an aluminum chelate complex capable of stabilizing the degree of vacuum in a film-forming chamber in the vapor deposition step and producing efficiently a high-quality organic EL device which shows excellent reliability and durability in practical use and an organic EL device using the said aluminum chelate complex. The aluminum chelate complex useful as an organic EL material is represented by L | 05-21-2009 |
20100181553 | ORGANIC ELECTROLUMINESCENT DEVICE MATERIAL AND ORGANIC ELECTROLUMINESCENT DEVICE - Disclosed is an organic electroluminescent device (organic EL device) that utilizes phosphorescence and is improved in luminous efficiency and fully secured of driving stability. The organic EL device comprises an anode, an organic layer containing a hole-transporting layer, a light-emitting layer, and an electron-transporting layer, and a cathode piled one upon another on a substrate while the hole-transporting layer is disposed between the light-emitting layer and the anode and the electron-transporting layer is disposed between the light-emitting layer and the cathode. The light-emitting layer comprises an aluminum heterocomplex or dimeric complex of deuterated substituted or unsubstituted 2-methyl-8-hydroxyquinoline (Me8HQ-D) in which the hydrogen atoms in the methyl group of substituted or unsubstituted 2-methyl-8-hydroxyquinoline (Me8HQ) are deuterated as a host material and an organic metal complex containing at least one metal selected from groups 7 to 11 of the periodic table as a guest material. | 07-22-2010 |
Shojiro Matsuo, Fukuoka JP
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20090097594 | MIRROR SUB-CARRIER DEMODULATION CIRCUIT, RECEIVING DEVICE WITH THE SAME, AND MIRROR SUB-CARRIER DEMODULATING METHOD - A mirror sub-carrier demodulation circuit includes a waveform generation unit | 04-16-2009 |
20150281833 | DIRECTIVITY CONTROL APPARATUS, DIRECTIVITY CONTROL METHOD, STORAGE MEDIUM AND DIRECTIVITY CONTROL SYSTEM - A directivity control apparatus controls a directivity of a sound collected by a sound collecting unit including a plurality of microphones. A beam forming unit forms a beam in a direction from the sound collecting unit toward a sound source corresponding to a position designated in an image on a display unit. A magnification setting unit sets a magnification for magnifying or demagnifying the image in the display according to an input. The beam forming unit also changes a size of the formed beam in accordance with the magnification set by the magnification setting unit. | 10-01-2015 |
20150350621 | SOUND PROCESSING SYSTEM AND SOUND PROCESSING METHOD - A recorder receives designation of a video which is desired to be reproduced from a user. If designation of one or more designated locations where sound is emphasized on a screen of a display which displays the video is received by the recorder from the user via an operation unit during reproduction or temporary stopping of the video, a signal processing unit performs an emphasis process on audio data, that is, the signal processing unit emphasizes audio data in directions directed toward positions corresponding to the designated locations from a microphone array by using audio data recorded in the recorder. A reproducing device reproduces the emphasis-processed audio data and video data in synchronization with each other. | 12-03-2015 |
Sigeru Matsuo, Fukuoka JP
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20110174125 | METHOD OF SHEARING THIN PLATE - Provided is a method of shearing a thin plate with high quality without a need for narrowing a clearance by precision machining. The method comprises: placing a thin plate ( | 07-21-2011 |
Yoshinori Matsuo, Fukuoka JP
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20150353426 | MAGNESIA CARBON BRICK - A magnesia carbon brick with increased denseness (lowering the porosity) and high durability relative to conventional magnesia carbon bricks. The magnesia carbon brick includes a magnesia raw material and a graphite, with the magnesia carbon brick containing the graphite with amount of in the range of 3% or more by mass and 25% or less by mass and the magnesia raw material with amount of in the range of 75% or more by mass and 97% or less by mass, the both amounts being relative to total amount of the magnesia raw material and the graphite; and an apparent porosity thereof after reductive firing for 3 hours at 1400° C. is 7.8% or less. | 12-10-2015 |
20150368159 | MAGNESIA CARBON BRICK - In the present invention, the attempt was made to increase the denseness (to lower the porosity) of a magnesia carbon brick furthermore thereby providing the magnesia carbon brick having a high durability never found in the past. The magnesia carbon brick of the present invention comprises a magnesia raw material and a graphite, wherein the magnesia carbon brick contains the graphite with the amount thereof in the range of 8% or more by mass and 25% or less by mass and the magnesia raw material with the amount thereof in the range of 75% or more by mass and 92% or less by mass, the both amounts being relative to the total amount of the magnesia raw material and the graphite; as a grain size distribution of the magnesia raw material, the magnesia raw material having particle diameter of in the range of 0.075 mm or more and 1 mm or less is blended with the amount thereof being 35% or more by mass relative to the total amount of the magnesia raw material and the graphite, and a mass ratio of the magnesia raw material having the particle diameter of in the range of 0.075 mm or more and 1 mm or less to the magnesia raw material having the particle diameter of less than 0.075 mm is 4.2 or more; and an apparent porosity thereof after firing in reducing atmosphere for 3 hours at 1400° C. is 7.8% or less. | 12-24-2015 |