Patents by Inventor Bruce A. Holmes
Bruce A. Holmes has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20040059077Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.Type: ApplicationFiled: August 15, 2003Publication date: March 25, 2004Applicant: Cambridge Display Technology Ltd.Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
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Publication number: 20040052944Abstract: A method for the patterned deposition of a material comprises the steps of dissolving or suspending said material in a solvent phase comprising compressed carbon dioxide, and depositing the solution or suspension onto a surface, evaporation of the solvent phase leaving a patterned deposit of said material. This method is particularly suitable for the patterned deposition of polymers and small organic molecules in organic light emitting diodes and organic transistors.Type: ApplicationFiled: October 28, 2003Publication date: March 18, 2004Inventors: Bushra Al-Duri, Filipe Gaspar, Andrew Bruce Holmes, Wilhelm Theodorus Stefanus Huck, Gary Leeke, Tiejun Lu, Christine Keiko Luscombe, Jonathan Seville, Regina Santos
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Patent number: 6693159Abstract: Highly cross-linked, maroporous/mesoporous polymer monoliths are prepard using supercritical carbon dioxide (scCO2) as the solvent and porogen for the polymerisation of monomers having more than one polymerisable group, at a monomer concentration in CO2 of more than 40 vol %. The procedure allows the direct formation of dry, solvent-free, macroporous/mesoporous cross-linked monoliths with large surface area and well-controlled pore size distribution.Type: GrantFiled: September 28, 2001Date of Patent: February 17, 2004Assignee: Cambridge University Technical Services LimitedInventors: Andrew Bruce Holmes, Andrew Ian Cooper
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Patent number: 6626566Abstract: The present invention provides a compound or complex comprising at least two moieties, each moiety being comprised of two or more thiophenes fused directly to each other. Also provided is a method for the production of the compounds of the present invention, which method comprises the coupling of one fused thiophene derivative to another fused thiophene derivative.Type: GrantFiled: May 24, 2002Date of Patent: September 30, 2003Assignee: Cambridge Display Technology LimitedInventors: Andrew Bruce Holmes, Stephen Carl Moratti, Xiao-Chang Li, Henning Sirringhaus, Arno Kraft, Michael Mark Murray
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Publication number: 20030166810Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.Type: ApplicationFiled: December 6, 2002Publication date: September 4, 2003Applicant: Cambridge Display Technology Ltd.Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
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Publication number: 20030088112Abstract: The present invention provides a compound or complex comprising at least two moieties, each moiety being comprised of two or more thiophenes fused directly to each other. Also provided is a method for the production of the compounds of the present invention, which method comprises the coupling of one fused thiophene derivative to another fused thiophene derivative.Type: ApplicationFiled: May 24, 2002Publication date: May 8, 2003Applicant: Cambridge Display Techonology LimitedInventors: Andrew Bruce Holmes, Stephen Carl Moratti, Xiao-Chang Li, Henning Sirringhaus, Arno Kraft, Michael Mark Murray
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Patent number: 6559256Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.Type: GrantFiled: April 28, 2000Date of Patent: May 6, 2003Assignee: Cambridge Display Technology Ltd.Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
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Publication number: 20030008991Abstract: Optical devices fabricated from solvent processible polymers suffer from susceptibility to solvents and morphological changes. A semiconductive polymer capable of luminescence in an optical device is provided. The polymer comprises a luminescent film-forming solvent processible polymer which contains cross-linking so as to increase its molar mass and to resist solvent dissolution, the cross-linking being such that the polymer retains semiconductive and luminescent properties.Type: ApplicationFiled: April 28, 2000Publication date: January 9, 2003Inventors: Andrew Bruce Holmes, Xiao-Chang Li, Stephen Carl Moratti, Kenneth Andrew Murray, Richard Henry Friend
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Patent number: 6458985Abstract: A process for the transformation of an organic molecule catalyzed by a ligand-metal complex, is conducted in compressed CO2 as a solvent, wherein the complex comprises a perfluorinated group. Further, a process for the polymerization of a monomer containing two or more polymerizable groups, optionally together with another copolymerizable monomer, to give a cross-linked polymer in the form of essentially spherical particles, is conducted in compressed CO2 as a solvent, typically in the presence of a surfactant.Type: GrantFiled: July 28, 2000Date of Patent: October 1, 2002Assignee: Cambridge University Technical Services, Ltd.Inventors: Andrew Bruce Holmes, Andrew Ian Cooper, Michael Andrew Carroll
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Patent number: 6403809Abstract: The present invention provides a compound or complex comprising at least two moieties, each moiety being comprised of two or more thiophenes fused directly to each other. Also provided is a method for the production of the compounds of the present invention, which method comprises the coupling of one fused thiophene derivative to another fused thiophene derivative.Type: GrantFiled: May 30, 2000Date of Patent: June 11, 2002Assignee: Cambridge Display Technolog LimitedInventors: Andrew Bruce Holmes, Stephen Carl Moratti, Xiao-Chang Li, Henning Sirringhaus, Arno Kraft, Michael Mark Murray
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Patent number: 6366238Abstract: A modular beamformer system for providing signals to at least two radiating elements of a phased array antenna is provided. The system includes a right-hand circular polarization beamformer module and a left-hand circular polarization beamformer module. The left and right circular polarization beamformer modules are coupled to two radiating elements. Each beamformer module includes two groups of beamforming circuitry, one per radiating element. At least one feeder line extends from each beamforming circuitry and is coupled to one of the radiating elements to transmit an output of each beamforming circuitry.Type: GrantFiled: February 20, 2001Date of Patent: April 2, 2002Assignee: The Boeing CompanyInventors: Walter R. DeMore, Bruce A. Holmes, Martin Nunez
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Patent number: 6249439Abstract: A millimeter wave multilayer phased array assembly has a multilayer board consisting of several laminated printed wiring boards (PWBs) and a frame having a waveguide input and waveguide output. The PWBs are made of a high frequency laminate material and have a pattern of metalization to perform varying electronic tasks. These tasks include electrical interconnection, RF signal transmission, DC current routing and DC signal routing.Type: GrantFiled: October 21, 1999Date of Patent: June 19, 2001Assignee: Hughes Electronics CorporationInventors: Walter R. DeMore, Richard A. Holloway, Bruce A. Holmes, Benjamin T. Johnson, Dale A. Londre, Lloyd Y. Nakamura
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Patent number: 5965979Abstract: A method of making a light emitting device comprises the laminating together of two self-supporting components, at least one of which has a light emitting layer (12) on an inner surface thereof. A first self-supporting component is formed by coating a first substrate (10) with an organic light emissive material (12). A second self-supporting component is formed by coating a second substrate (2) with an organic material which is one of a light emissive material and a charge transport material (8). The two self-supporting components are laminated together such that the organic materials (8, 12) are located between the substrates (2, 10) in the finished device.Type: GrantFiled: September 2, 1997Date of Patent: October 12, 1999Assignee: Cambridge Display Technology LimitedInventors: Richard Henry Friend, Andrew Bruce Holmes, Stephen Carl Moratti
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Patent number: 5821690Abstract: An electroluminescent device includes first and second layers (6, 12) of light emitting semiconductive conjugated polymers with an electrode arrangement (4, 8, 10, 14) for injecting charge carriers into both light emissive layers to cause light to be emitted therefrom. The first and second light emitting layers are in viewing overlap, and the electrode arrangement includes two sets of electrodes (4, 8, 10, 12) which can be operated independently. The first light emissive layer is arranged to emit radiation of a first wavelength when excited and the second light emissive layer is arranged to emit radiation of a second wavelength when excited. The electroluminescent device can thus be operated to cause either radiation of the first wavelength or radiation of the second wavelength or both to be emitted and viewed.Type: GrantFiled: April 22, 1996Date of Patent: October 13, 1998Assignee: Cambridge Display Technology LimitedInventors: Josef Herbert Ferdinand Martens, Paul Leslie Burn, Karl Pichler, Richard Henry Friend, Andrew Bruce Holmes
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Patent number: 5807627Abstract: An electroluminescent device has at least two active semiconductive conjugated polymer light emitting layers arranged between a cathode and an anode. The layers are arranged so that at least part of at least two layers lie in an emission zone of the device.Type: GrantFiled: April 30, 1997Date of Patent: September 15, 1998Assignee: Cambridge Display Technologies Ltd.Inventors: Richard Henry Friend, Andrew Bruce Holmes, Donal Donat Conor Bradley, Paul Leslie Burn, Arno Kraft, Adam Richard Brown, Jeremy Henley Burroughes, Neil Clement Greenham
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Patent number: 5747182Abstract: In an electroluminescent device which comprises a layer of a semiconductive conjugated polymer between positive and negative charge carrier injecting electrodes, a barrier layer is arranged between the layer of semiconductive conjugated polymer and the charge carrier injecting layer for negative charge carriers. The barrier layer protects the layer of semiconductive conjugated polymer from for example mobile ions released by the reactive charge carrier injecting layer. The barrier layer can in some circumstances also itself be light-emissive.Type: GrantFiled: April 3, 1995Date of Patent: May 5, 1998Assignee: Cambridge Display Technology LimitedInventors: Richard Henry Friend, Andrew Bruce Holmes, Donal Donat Conor Bradley, Paul Leslie Burn, Arno Kraft, Adam Richard Brown, Jeremy Henley Burroughes, Neil Clement Greenham
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Patent number: 5653914Abstract: An electroluminescent device is provided incorporating an emissive layer comprising a processible polymer matrix such as poly(methylmethacrylate) and a chromophoric component such as an asymmetric stilbene or distyrylbenzene. The chromophoric component is blended with the polymer matrix or covalently attached thereto as a side chain and is selected to emit radiation in the region 400 nm to 500 nm when excited to luminesce.Type: GrantFiled: October 2, 1995Date of Patent: August 5, 1997Assignee: Cambridge Display Technology LimitedInventors: Andrew Bruce Holmes, Arno Kraft, Paul Leslie Burn, Stephen Carl Moratti, Richard Henry Friend, Donal Donat Conor Bradley, Neil Clement Greenham, Adam Richard Brown, Josef Herbert Ferdinand Martens, Franco Cacialli, Johannes Gruener
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Patent number: 4113998Abstract: A two-wired telephone testing system employing a low frequency test signal which is a submultiple of the power line frequency. This test signal is applied between the two-wires or between either wire at a point of potential reference (ground). A measure of the integrated value of the current between the connected points is then made for a period equal to one-half cycle of the applied signal with one polarity and one-half cycle with the polarity of the measured signal reversed. The integration periods are selected to be in phase with the applied signal for determining conductance and 90.degree. out of phase for determining susceptance. Direct current measurement can also be made for the same time periods.Type: GrantFiled: October 14, 1975Date of Patent: September 12, 1978Assignee: Teradyne, Inc.Inventors: Glynn R. Ashdown, Thomas McCartney, Bruce Holmes