Patent application number | Description | Published |
20080287709 | Method of Separating Acids from Chemical Reaction Mixtures by Means of Apolar Amines - A process for the removal of acids from reaction mixtures, comprising at least one product of value which is sparingly soluble in water, by at least one unpolar amine as an auxiliary base, which includes: a) reacting the auxiliary base with the acid with formation of a salt; b) reacting the salt formed in step a) with a further base which accepts the acid with liberation of the auxiliary base and combines with the acid to be accepted from the auxiliary base to form a salt which is very readily soluble in water; c) extraction of the mixture obtained in step b) with water or an aqueous medium, wherein the salt of the further base dissolves in the aqueous phase and the product of value, or the solution of the product of value, in a suitable solvent and the auxiliary base form at least one separate nonaqueous phase; and d) removal by distillation of at least part of any solvent present from the at least one nonaqueous phase obtained in step c), to form two nonmiscible liquid phases. | 11-20-2008 |
20130172596 | PROCESS FOR PREPARING 6-CHLORODIBENZO[D,F][1,3,2]DIOXAPHOSPHEPIN - The present invention relates to a process for preparing 6-chlorodibenzo[d,f][1,3,2]dioxaphosphepin (I) | 07-04-2013 |
20130184478 | CRYSTALLINE SOLVATE AND NON-SOLVATED FORMS OF 6,6'-[[3,3',5,5'-TETRAKIS(1,1-DIMETHYLETHYL)-[1,1'-BIPHENYL]-2,2'-DIYL]BI- S(OXY)]BIS-DIBENZO [D,F] [1,3,2]-DIOXAPHOSPHEPINE - The present invention relates to a crystalline non-solvated form of 6,6′-[[3,3′,5,5′-tetrakis(1,1-dimethylethyl)-[1,1′-biphenyl]-2,2′-diyl]bis(oxy)]bis-dibenzo[d,f][1,3,2]-dioxaphosphepine (compound I) and toluene-solvates and acetone-solvates thereof. | 07-18-2013 |
20130225849 | METHOD OF PURIFYING ORGANIC DIPHOSPHITE COMPOUNDS - The present invention relates to a method of purifying organic diphosphite compounds. | 08-29-2013 |
Patent application number | Description | Published |
20100132407 | METHOD FOR PRODUCING A TUBE OF QUARTZ GLASS BY ELONGATING A HOLLOW CYLINDER OF QUARTZ GLASS - In a known method for producing a tube of quartz glass by elongation, a hollow cylinder of quartz glass is continuously supplied to a heating zone, softened therein zone by zone, and a tube strand is drawn in the direction of a drawing axis out of the softened region by using a roll puller, the roll puller comprising a frame by which a plurality of puller rolls are fixed, which are rotatable around a rotation axis and which are distributed over the circumference of the tube strand and adjoining the tube strand with their cylindrical outer surface. Starting therefrom, to indicate a vertical drawing method in which a high draw ratio can also be accomplished with little constructional effort by using a take-off unit in the form of a roll puller and which simultaneously allows an optimization of the dimensional stability of the quartz glass tubes obtained, and which particularly avoids material losses caused by ovality and siding, the invention suggests that the frame of the roll puller s stationary, and the hollow cylinder and the tube strand are rotated about the drawing axis relative to one another, the relative rotation being set to a range between 0.01 and 5 revolutions per linear meter of drawn-off tube strand. | 06-03-2010 |
20100260949 | SYNTHETIC SILICA GLASS TUBE FOR THE PRODUCTION OF A PREFORM - Known synthetic quartz glass tubes for the production of a preform have an inner bore with a surface layer produced without using tools in the molten state and an inner zone. The aim of the invention is to provide a tube which does not release any OH groups to the surroundings. For this purpose, the surface layer ( | 10-14-2010 |
20140174134 | SYSTEM AND METHOD FOR FABRICATING OPTICAL FIBER PREFORM AND OPTICAL FIBER - A method of manufacturing an optical fiber preform or an optical fiber is provided. The method includes the steps of: (a) providing a glass tube and a glass core rod; (b) inserting the glass core rod into the glass tube to form an assembled body; (c) heating the assembled body to cause the glass tube to collapse on and adhere to the glass core rod; and (d) treating an interface gap between the glass core rod and the glass tube during heating of at least a portion of the assembled body. Treating of the interface gap involves: (i) establishing a vacuum pressure in the interface gap, (ii) increasing a pressure of the interface gap by a treatment gas through the interface gap for a predetermined time, and (iii) re-establishing a vacuum pressure in the interface gap after the predetermined time has elapsed. | 06-26-2014 |
Patent application number | Description | Published |
20090153240 | COMPARATOR WITH SENSITIVITY CONTROL - A comparator has a differential input stage, a current source coupled to the differential input stage for providing a tail current to one side of the differential input stage, and a differential load coupled to the differential pair and having at least one diode coupled load transistor per differential side. A load current through either one of the at least one diode coupled load transistor on either differential side is mirrored with a current mirror configuration to provide a current be fed to a respective node, each node being coupled to a respective variable biasing current source and a respective other side of the differential input stage, so as to provide a variable positive feedback to the differential input stage. | 06-18-2009 |
20090212916 | TRANSPONDER BACK SCATTER MODULATOR WITH REGULATED MODULATION DEPTH - An RFID transponder includes an antenna and modulation circuitry for back scatter modulation at an local voltage rail connected to the antenna such that a voltage of the antenna is maintained within a predetermined range. The modulation circuitry includes a voltage regulation loop including a rectifier connected between the antenna and the local voltage rail (Vlocal) for rectifying a voltage from the antenna so as to load the local voltage rail (Vlocal) with the rectified voltage from the antenna, an error amplifier (A | 08-27-2009 |
20100164725 | TRANSPONDER DEMODULATOR FOR A LOW ANTENNA LIMITER THRESHOLD - An RFID transponder having an antenna for receiving an RF signal including an amplitude modulated downlink data signal, and a demodulating stage coupled to the antenna for receiving a derived RF signal which is derived from the received RF signal. The demodulating stage has a first filter for extracting a field strength signal component from the derived RF signal and a second filter for extracting the modulated downlink data signal component from the derived RF signal. Further, a demodulator is coupled to the second filter to receive the modulated downlink signal for demodulating the modulated downlink data signal component and coupled to the first filter to receive the field strength signal such that the demodulator is adapted to vary a demodulation sensitivity parameter in response to the field strength signal. | 07-01-2010 |
Patent application number | Description | Published |
20090032309 | SLEEVE STRUCTURES FOR EARTH-BORING TOOLS, TOOLS INCLUDING SLEEVE STRUCTURES AND METHODS OF FORMING SUCH TOOLS - Earth-boring tools comprise a bit body comprising a face and a plurality of blades extending radially outward over the face and forming gage regions. A shank is coupled to the bit body and includes a threaded portion for connecting to a drill string. A sleeve structure is positioned adjacent to the bit body and surrounds a portion of the shank, the sleeve structure extending from adjacent the bit body to proximate the threaded portion of the shank. An outer surface of the sleeve structure comprises a plurality of circumferentially spaced gage pads extending thereover and may comprise a plurality of breaker flats. | 02-05-2009 |
20120168231 | DRILL BITS WITH BEARING ELEMENTS FOR REDUCING EXPOSURE OF CUTTERS - A bearing element for a rotary, earth boring drag bit effectively reduces an exposure of at least one adjacent cutting element by a readily predictable amount, as well as a depth-of-cut (DOC) of the cutter. The bearing element has a substantially uniform thickness across substantially an entire area thereof The bearing element also limits the amount of unit force applied to a formation so that the formation does not fail. The bearing element may prevent damage to cutters associated therewith, as well as possibly limit problems associated with bit balling, motor stalling and related drilling difficulties. Bits including the bearing elements, molds for forming the bearing elements and portions of bodies of bits that carry the bearing elements, methods for designing and fabricating the bearing elements and bits including the same, and methods for drilling subterranean formations are also disclosed. | 07-05-2012 |
20130248260 | DRILL BITS WITH BEARING ELEMENTS FOR REDUCING EXPOSURE OF CUTTERS - A bearing element for a rotary, earth boring drag bit effectively reduces an exposure of at least one adjacent cutting element by a readily predictable amount, as well as a depth-of-cut (DOC) of the cutter. The bearing element has a substantially uniform thickness across substantially an entire area thereof. The bearing element also limits the amount of unit force applied to a formation so that the formation does not fail. The bearing element may prevent damage to cutters associated therewith, as well as possibly limit problems associated with bit balling, motor stalling and related drilling difficulties. Bits including the bearing elements, molds for forming the bearing elements and portions of bodies of bits that carry the bearing elements, methods for designing and fabricating the bearing elements and bits including the same, and methods for drilling subterranean formations are also disclosed. | 09-26-2013 |