Petropoulos, US
Athanasios Petropoulos, Hudson, NH US
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20150280324 | ANTENNA ASSEMBLIES - According to various aspects, exemplary embodiments are disclosed of antenna assemblies. In an exemplary embodiment, an antenna assembly generally includes a feed network and a ground plane. Radiating dipoles or dipole radiating elements are along or on opposite sides of the feed network and the ground plane. The radiating dipoles or dipole radiating elements may be operable simultaneously and co-locate radio frequency currents for a first frequency band and a second frequency band. | 10-01-2015 |
Athanasios Petropoulos, Nashua, NH US
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20080284656 | RADIO FREQUENCY IDENTIFICATION (RFID) ANTENNA ASSEMBLIES WITH FOLDED PATCH-ANTENNA STRUCTURES - Exemplary embodiments are provided of RFID antenna assemblies having folded patch-antenna structures and that are configured with circular polarization or dual linear polarization. An antenna assembly may generally include two folded patch-antenna structures oriented generally perpendicularly to each other. Each folded patch may create a linear polarization wave. When each folded patch is fed independently, the antenna assembly radiates two independent waves that are perpendicularly polarized to each other, therefore providing a dual polarized antenna. In other embodiments, the antenna assembly may include two folded patch-antenna structures again oriented generally perpendicularly to each other. By feeding each folded patch with a 90-degree phase delay between them, a circular polarization wave is radiated. A power divider network may be used to feed the two folded patches with the 90-degree phase delay. The two folded patches may be integrated so as to form a cavity or housing for a printed circuit board. | 11-20-2008 |
20090184827 | PLANAR DISTRIBUTED RADIO-FREQUENCY IDENTIFICATION (RFID) ANTENNA ASSEMBLIES - Disclosed are exemplary embodiments of passive radio-frequency identification (RFID) readers operable for creating a relatively uniform near field adjacent a planar surface for reading RFID tags generally above the planar surface. The RFID reader may include a plurality of antenna elements distributed in an array underneath the planar surface. A central antenna element may be located within the array generally between two or more perimetric antenna elements. A network may distribute electromagnetic energy to the antenna elements such that a current phase of at least one perimetric antenna element is out of phase with and lagging a current phase of the central antenna element. Alternatively, the perimetric antenna elements may be parasitically coupled to the central antenna element, such that a current phase of at least one perimetric antenna element is out of phase with and lagging a current phase of the central antenna element. | 07-23-2009 |
Christos Petropoulos, South San Francisco, CA US
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20150065381 | METHODS OF IDENTIFYING NOVEL HIV-1 IMMUNOGENS - The present application relates to identifying one or more components of HIV envelope glycoprotein which bind to broadly neutralizing antibodies, which may be utilized as research tools for developing HIV-1 vaccine immunogens, antigens for crystallization and/or for identifying of broad neutralizing antibodies. | 03-05-2015 |
Christos Petropoulos, Half Moon Bay, CA US
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20130274276 | METHODS AND COMPOSITIONS FOR DETERMINING VIRUS SUSCEPTIBILITY TO NON-NUCLEOSIDE REVERSE TRANSCRIPTASE INHIBITORS - Methods and compositions for the efficient and accurate determination of HIV susceptibility to a non-nucleoside reverse transcriptase inhibitor (NNRTI) are provided. In certain aspects, the methods involve detecting in a biological sample a nucleic acid encoding an HIV reverse transcriptase that comprises a mutation at codon 188, wherein the presence of the reverse transcriptase-encoding nucleic acid in the biological sample indicates that the HIV has a decreased susceptibility to an NNRTI. In certain embodiments, the HIV also contains one or more secondary mutations in reverse transcriptase. Also provided are methods for selecting a treatment for an HIV patient and methods for determining the selective advantage of a mutation or mutation profile. | 10-17-2013 |
Christos J. Petropoulos, Half Moon Bay, CA US
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20090215028 | Methods and Compositions for Determining Anti-HIV Drug Susceptibility and Replication Capacity of HIV - This invention relates, in part, to methods and compositions for determining the susceptibility of an HIV to an anti-HIV drug or the replication capacity of an HIV. In certain embodiments, the methods comprise culturing a host cell in the presence of the anti-HIV drug, measuring the activity of the indicator gene in the host cell; and comparing the activity of the indicator gene as measured with a reference activity of the indicator gene. In certain embodiments, the difference between the measured activity of the indicator gene relative to the reference activity correlates with the susceptibility of the HIV to the anti-HIV drug, thereby determining the susceptibility of the HIV to the anti-HIV drug. In certain embodiments, the difference between the measured activity of the indicator gene relative to the reference activity indicates the replication capacity of the HFV, thereby determining the replication capacity of the HIV. In certain embodiments, the host cell comprises a patient-derived segment and an indicator gene. In certain embodiments, the patient-derived segment comprises a nucleic acid sequence that encodes integrase or RNAse H. | 08-27-2009 |
20100167266 | Compositions and Methods for Determining Whether a Subject Would Benefit from Co-Receptor Inhibitor Therapy - The present invention provides methods and compositions for determining whether a subject would benefit from co-receptor inhibitor therapy. In certain aspects, the methods can be used to determine whether a subject infected with a dual-mixed tropic population of HIV would benefit from CCCR5-inhibitor therapy or CXCR4-inhibitor therapy, the methods comprising determining whether the HIV population is a homogeneous or heterogeneous population of HIV, wherein the nature of the homogenous or heterogenous population of HIV indicates whether the patient would benefit from co-receptor inhibitor therapy. | 07-01-2010 |
20110033836 | METHODS FOR DETERMINING THE PRESENCE OF ANTIBODIES BLOCKING VIRAL INFECTION - The present invention provides a method for identifying whether a compound inhibits entry of a virus into a cell which comprises: (a) obtaining nucleic acid encoding a viral envelope protein from a patient infected by the virus; (b) co-transfecting into a first cell (i) the nucleic acid of step (a), and (ii) a viral expression vector which lacks a nucleic acid encoding an envelope protein, and which comprises an indicator nucleic acid which produces a detectable signal, such that the first cell produces viral particles comprising the envelope protein encoded by the nucleic acid obtained from the patient; (c) contacting the viral particles produced in step (b) with a second cell in the presence of the compound, wherein the second cell expresses a cell surface receptor to which the virus binds; (d) measuring the amount of signal produced by the second cell in order to determine the infectivity of the viral particles; and (e) comparing the amount of signal measured in step (d) with the amount of signal produced in the absence of the compound, wherein a reduced amount of signal measured in the presence of the compound indicates that the compound inhibits entry of the virus into the second cell. | 02-10-2011 |
20140272930 | Compositions And Methods For Determining Resistance To Inhibitors Of Virus Entry Using Recombinant Virus Assays - The invention provides a method for determining whether a human immunodeficiency virus is resistance to a viral entry inhibitor. The methods are particularly useful for determining resistance to inhibitors that act by a non-competitive mechanism. In certain aspects, the methods comprise determining whether an HIV population is resistant to an HIV entry inhibitor, comprising determining a log-sigmoid inhibition curve comprising data points for entry of the HIV population in the presence of varying concentrations of the HIV entry inhibitor, wherein if the entry of the HIV population cannot be completely inhibited by the HIV entry inhibitor, the HIV population is resistant to the HIV entry inhibitor. | 09-18-2014 |
Christos John Petropoulos, Half Moon Bay, CA US
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20120276522 | Methods and Compositions for Determining Virus Susceptibility to Integrase Inhibitors - Methods and compositions for the efficient and accurate determination of HIV susceptibility to an integrase inhibitor and/or HIV replication capacity are provided. In certain aspects, the methods involve detecting in a biological sample a nucleic acid encoding an HIV integrase that comprises a primary mutation at codon 143, wherein the mutation at codon 143 does not encode arginine (R) or cysteine (C), and wherein the presence of the integrase-encoding nucleic acid in the biological sample indicates that the HIV has a decreased susceptibility to an integrase inhibitor or altered replication capacity relative to a reference HIV. In certain embodiments, the HIV also contains one or more secondary mutations in integrase. Also provided are methods for determining the selective advantage of a mutation or mutation profile based on the difficulty to create the mutation, and its effect on susceptibility to an integrase inhibitor or replication capacity. | 11-01-2012 |
20130302782 | Methods for the Phenotypic Detection of HCV Inhibitor Resistant Subpopulations - Methods and compositions for the efficient and accurate determination of susceptibility of a hepatitis C virus (HCV) population to an HCV inhibitor are provided. In certain aspects, the methods involve introducing into a cell a patient derived segment, wherein the cell or the patient derived segment comprises an indicator nucleic acid that produces a detectable signal that is dependent on the HCV; measuring the expression of the indicator gene in the presence of varying concentrations of the HCV inhibitor; determining a standard curve of susceptibility; comparing the IC | 11-14-2013 |
John Petropoulos, Groton, MA US
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20090094235 | Ordering directory assistance search results by local popularity of search results - A platform for ordering search results according to result popularity a directory assistance service, itself, to determine the popularity of the listings associated with a particular category and, therefore, the order in which those listings should be delivered resulting from a category search. Priority may be determined by the popularity of each search result. For example, directory assistance users in a particular location will likely know which businesses have a reputation for providing the best service or highest-quality products. Such factors will determine the popularity of these businesses. Businesses that are more popular are likely to be selected more frequently from the category search results than those that are less popular. The system may examine the history of search results for each listing and order the results of a particular category search according to the number of historical requests for each returned listing. | 04-09-2009 |
John Panos Petropoulos, Emmaus, PA US
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20130293137 | TWO-WIRE DIMMER SWITCH FOR CONTROLLING LOW-POWER LOADS - A two-wire load control device such as a dimmer switch for controlling the amount of power delivered from an AC power source to an electrical load such as a high-efficiency lighting load may be provided. The load control device may include a bidirectional semiconductor switch coupled between the source and the load and a controller operable to control the bidirectional semiconductor switch. The load control device may also include a front accessible trimming actuator to adjust a low end intensity setting of the load control device. The trimming actuator may be coupled to the controller such that the controller may control the bidirectional semiconductor switch appropriately. Additionally, the trimming actuator may include indicia to help a user readily identify the proper low end intensity setting. | 11-07-2013 |
Labros Petropoulos, Chagrin Falls, OH US
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20100249575 | SUPPORT COMPONENT FOR USE IN IMAGING BY MAGNETIC RESONANCE AND X-RAY - A structural support component such as a head clamp for use in imaging of a part of a patient using Magnetic Resonance and X-ray imaging is formed of different materials each of which has an Aluminum equivalence factor of less than 10 mm and generally less than 6 mm and is arranged such that the presence of the structural support component in an imaging zone of a magnetic resonance imaging system when generating the image does not generate any visually determinable distortion in the image. The materials can be epoxy resin combined with a glass fiber substrate for easily machined parts, polyphenylene sulphide with random fiber reinforcement using glass fibers for high wear parts and polyurethane foam or Polymethacrylimide foam shaped to form a required member and covered on its outer surface with a layer formed from aramid fibers for elongate parts. | 09-30-2010 |
20100329414 | IMAGE GUIDED RADIATION THERAPY - Radiation therapy of a lesion in a part of a patient is carried out by maintaining the patient on a patient support table in fixed position using an immobilization device while the table is rotated between a magnetic resonance imaging system, a CT imaging system for generating a 360 degree scanned image of the patient at the location of the lesion and the radiation therapy system for generating a beam of radiation for treatment of the lesion and for scanning the beam 360 degrees around the lesion. The MR image locates the lesion and the CT system is used to calculate the treatment. Registration between the MR image, the CT image and the radiation treatment is provided by the fixed position of the part of the patient on the table which is held fixed using an immobilization system suitable for the part concerned which may include a molded head mask where the head is involved. | 12-30-2010 |
Labros Petropoulos, Minnetonka, MN US
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20150112187 | MR Imaging with RF Coil Integrated into Patient Engaging Component - In MR imaging of a body part in the magnetic field of a magnet, an RF signal is applied in a transmit stage to the subject to be imaged such that the subject generates an MR signal in response to the magnetic field and the RF signal applied with the MR signal being acquired in a receive stage using an RF coil where the RF coil is an integral element defined within a supporting element such as a pillow or U-shaped head support carrying the body part or within an article worn or carried by the body part such as a cast, brace, brassiere or vest. | 04-23-2015 |
Labros Petropoulos, Chgrin Falls, OH US
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20100327870 | MOVABLE TABLE FOR MAGNETIC RESONANCE IMAGING - In MR imaging, the patient is placed on the table in a configuration convenient for a surgical procedure and while in the configuration the patient is moved into the field of view by moving the magnet longitudinally and the table is moved in the bore relative to the magnet so as to optimize the part to be imaged within the field of view of the magnet. After imaging the table is moved back to the preset position and removed from the magnet for the surgical procedure to commence or continue. The movement includes movement along the longitudinal axis; transverse movement side to side; rolling movement about a longitudinal axis; tilting movement about a transverse axis and bending movement of the table relative to at least one transverse hinge line in the table at a position spaced from the ends of the table. | 12-30-2010 |
Michail Petropoulos, San Francisco, CA US
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20150363113 | PRECISELY TRACKING MEMORY USAGE IN MULTI-PROCESS COMPUTING ENVIRONMENT - Methods, systems, and apparatus, including computer programs encoded on computer storage media, for precisely tracking memory usage in a multi-process computing environment. One of the methods includes implementing an instance of a memory usage tracker (MUT) in each process running in a node of a computer system. A MUT can maintain an account of memory usage for each of multiple logical owners running on a process on which the MUT is running. The MUT can determine an actual memory quota for each owner, and enforce the actual memory quota of the owner. Enforcing the actual memory quota of the owner can include receiving each memory allocation request, checking each allocation request and a current state of the account against the actual quota, approving or rejecting each allocation request, communicating the approval or rejection to an underlying memory manager, and updating the owner account for each approved allocation request. | 12-17-2015 |
Takis Petropoulos, Austin, TX US
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20120144242 | SYSTEM AND METHOD FOR PROACTIVE MANAGEMENT OF AN INFORMATION HANDLING SYSTEM WITH IN-SITU MEASUREMENT OF END USER ACTIONS - Dissatisfaction variables track inputs made by an end user at an information handling system that are associated with end user dissatisfaction regarding the operation of the information handling system, such as corrective actions, so that an alert issues if a dissatisfaction variable changes by a predetermined amount over a predetermined time period. Dissatisfaction variables identify a pattern of a change in behavior by an end user rather than the operational status of system components. For example, an increase in end user forced shutdowns of the information handling system indicates end user dissatisfaction with the information handling system, such as repeated freezes of the operating system so that performing a timely diagnostics will improve end user satisfaction and proactively correct and impending system failure. | 06-07-2012 |
20140245078 | System and Method for Proactive Management of an Information Handling System with In-Situ Measurement of End User Actions - Dissatisfaction variables track inputs made by an end user at an information handling system that are associated with end user dissatisfaction regarding the operation of the information handling system, such as corrective actions, so that an alert issues if a dissatisfaction variable changes by a predetermined amount over a predetermined time period. Dissatisfaction variables identify a pattern of a change in behavior by an end user rather than the operational status of system components. For example, an increase in end user forced shutdowns of the information handling system indicates end user dissatisfaction with the information handling system, such as repeated freezes of the operating system so that performing a timely diagnostics will improve end user satisfaction and proactively correct and impending system failure. | 08-28-2014 |