Patents by Inventor Ronald N. Friel
Ronald N. Friel 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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Patent number: 5477285Abstract: In accordance with the present invention, an apparatus for developing a latent image formed on a photoreceptor, which is deposited on an interior surface of an output window of a display device, is disclosed. The developing apparatus includes a developing chamber, having a support surface for supporting the output window, a screen structure material reservoir for storing, deagglomerating and feeding the screen structure material, and a triboelectric gun assembly communicating with the reservoir. The gun assembly triboelectric charges and imparts a desired charge polarity to the screen structure material. The gun assembly further includes at least one material dispersing nozzle spaced from the support surface for distributing the charged material for deposition onto the latent image.Type: GrantFiled: October 6, 1993Date of Patent: December 19, 1995Assignee: Thomson Consumer Electronics, Inc.Inventors: George H. N. Riddle, Pabitra Datta, Ronald N. Friel, Dennis R. McCarthy, John J. Moscony, Eugene S. Poliniak, Peter M. Ritt, Robert E. Simms, Carl C. Steinmetz, Harry R. Stork, Charles M. Wetzel
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Patent number: 5413885Abstract: The method of electrophotographically manufacturing a screen assembly on an interior surface of a faceplate panel for a color CRT, according to the present invention includes the step of forming a photoreceptor by sequentially coating the surface of the panel with a conductive solution to form a volatilizable conductive layer and then overcoating the conductive layer with an organic photoconductive solution comprising a suitable resin, an electron donor material, an electron acceptor material, a surfactant and an organic solvent to form a volatilizable photoconductive layer.Type: GrantFiled: December 22, 1993Date of Patent: May 9, 1995Assignee: RCA Thompson Licensing Corp.Inventors: Pabitra Datta, Nitin V. DeSai, Eugene S. Poliniak, Ronald N. Friel, Wilber C. Stewart
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Patent number: 5405722Abstract: The invention relates to a method of electrophotographically manufacturing a luminescent screen assembly for a color CRT by utilizing materials whose volatilizable constituents are substantially completely baked-out in the same step in which the faceplate panel is frit sealed to the funnel of the tube envelope. This method eliminates a dedicated panel bake before frit sealing of the panel to the funnel.Type: GrantFiled: December 22, 1993Date of Patent: April 11, 1995Assignee: RCA Thomson Licensing Corp.Inventors: Pabitra Datta, Nitin V. DeSai, Ronald N. Friel, Eugene S. Poliniak
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Patent number: 5370952Abstract: The method of electrophotographically manufacturing a screen assembly on an interior surface of a faceplate panel for a color CRT, according to the present invention, includes the steps of sequentially coating the surface of the panel with a conductive solution to form a volatilizable organic conductive layer and then overcoating the conductive layer with a photoconductive solution to form a volatilizable organic photoconductive layer. The conductive layer, comprising a quaternary ammonium polyelectrolyte and a surfactant, provides an electrode for the photoconductive layer and has improved electrical and physical properties compared to prior conductive layers.Type: GrantFiled: December 22, 1993Date of Patent: December 6, 1994Assignee: RCA Thomson Licensing Corp.Inventors: Pabitra Datta, Nitin V. DeSai, Ronald N. Friel, Eugene S. Poliniak
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Patent number: 5132188Abstract: A method of electrophotographically manufacturing a luminescent screen on an interior concave surface of a CRT faceplate panel having a major axis with a first center of curvature and a minor axis with a second center of curvature, the method including the steps of utilizing a charging apparatus for uniformly charging a photoconductive layer disposed on the concave surface of the faceplate panel by providing a corona voltage from a corona generator to at least one corona charger which has an arcuately-shaped charging electrode, the corona charger has a center of curvature substantially concentric with a center of curvature of the concave surface of the panel, a support arm attached to the corona charger is pivotably located at the other center of curvature, the corona charger substantially conforms to, and is spaced from the photoconductive layer on the concave surface, and moving the corona charger across the concave surface.Type: GrantFiled: August 13, 1990Date of Patent: July 21, 1992Assignee: RCA Thomson Licensing Corp.Inventors: Pabitra Datta, George H. Riddle, Ronald N. Friel, Robert E. Simms, Carl C. Steinmetz
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Patent number: 5093217Abstract: An apparatus for electrophotographically manufacturing a luminescent screen assembly on a substrate for use within a CRT includes a developer for developing a photoconductive layer, having a latent image thereon, with a dry-powdered, triboelectrially-charged screen structure materials. The photoconductive layer overlies a conductive layer in contact with the substrate. A grid-developing electrode is located at a distance from the photoconductive layer that is large relative to the smallest dimension of the latent image. The electrode is biased with a suitable potential to influence the deposition of the charged screen structure materials onto the latent image on the photoconductive layer. A method for electrophotographically manufacturing the screen assembly utilizing the grid-developing electrode is also disclosed.Type: GrantFiled: October 11, 1989Date of Patent: March 3, 1992Assignee: RCA Thomson Licensing CorporationInventors: Pabitra Datta, Randall E. McCoy, Ronald N. Friel, John A. van Raalte, Wilber C. Stewart
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Patent number: 5083959Abstract: An apparatus for uniformly charging a photoconductive layer disposed on an interior, non-planar surface of a faceplate panel of a CRT during electrophotographic screen processing of the panel includes a corona generator having at least one corona charger and a mechanism for moving the corona charger across the non-planar surface of the faceplate panel. The corona charger substantially conforms to, and is spaced from the photoconductive layer on the non-planar, interior surface of the faceplate panel.Type: GrantFiled: August 13, 1990Date of Patent: January 28, 1992Assignee: RCA Thomson Licensing Corp.Inventors: Pabitra Datta, George H. N. Riddle, Ronald N. Friel, Robert E. Simms, Carl C. Steinmetz
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Patent number: 5012155Abstract: The method of surface-treating dry-powdered phosphor particles for use in manufacturing a viewing screen for a CRT to control the triboelectric charge characteristics of the phosphor particles includes the steps of dissolving a suitable quantity of a polymeric coupling agent in a suitable solvent to form a mixture, surface-treating the phosphor particles by adding them to the mixture to provide a coating of the coupling agent thereon, and then drying the surface-treated phosphor particles. The resultant dry-powdered surface-treated phosphor particles are used to make a luminescent viewing screen for a CRT. The coupling agent controls the triboelectric charge characteristics of the phosphor particles during the electrophotographic manufacturing of the screen.Type: GrantFiled: December 22, 1989Date of Patent: April 30, 1991Assignee: RCA Licensing Corp.Inventors: Pabitra Datta, Ronald N. Friel, Robert P. Thompson
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Patent number: 4975619Abstract: A method of surface-treating dry-powdered phosphor particles to control the triboelectric charge characteristics thereof includes the steps of providing the phosphor particles with a first coating of silica, dissolving a coupling agent selected from the group consisting of silanes and titanates in a suitable solvent to form a mixture, surface-coating the silica-coated phosphor particles with the mixture to provide a second coating of the coupling agent on the phosphor particles, filtering the surface-treated particles, rinsing the surface-treated particles with the solvent, and drying the surface-treated particles. The resultant dry-powdered surface-treated phosphor particles are used to make a luminescent viewing screen for a CRT. The coupling agent overlying the silica coating controls the triboelectric charging characteristics of the phosphor particles during the electrophotographic manufacturing of the screen.Type: GrantFiled: December 22, 1989Date of Patent: December 4, 1990Assignee: RCA Licensing Corp.Inventors: Pabitra Datta, Ronald N. Friel
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Method of electrophotographically manufacturing a luminescent screen assembly for a cathode-ray-tube
Patent number: 4921767Abstract: The method of electrophotographically manufacturing a screen assembly on a substrate for use within a CRT, according to the present invention, includes the steps of sequentially coating a substrate with a conductive layer and an overcoating of a photoconductive layer, establishing an electrostatic charge on the photoconductive layer, and exposing selected areas of the photoconductive layer to visible light to affect the charge thereon. Then the photoconductive layer is developed with a charged screen structure material. The improved process utilizes a dry-powdered screen structure material having at least a surface charge control agent thereon to control the triboelectrical charging of the screen structure material.Type: GrantFiled: December 21, 1988Date of Patent: May 1, 1990Assignee: RCA Licensing Corp.Inventors: Pabitra Datta, Ronald N. Friel -
Patent number: 4921727Abstract: A method of surface-treating dry-powdered phosphor particles to control the triboelectric charge characteristics thereof includes the steps of providing the phosphor particles with a first coating of silica, dissolving a coupling agent selected from the group consisting of silanes and titanates in a suitable solvent to form a mixture, surface-coating the silica-coated phosphor particles with the mixture to provide a second coating of the coupling agent on the phosphor particles, filtering the surface-treated particles, rinsing the surface-treated particles with the solvent, and drying the surface-treated particles. The resultant dry-powdered surface-treated phosphor particles are used to make a luminescent viewing screen for a CRT. The coupling agent overlying the silica coating controls the triboelectric charging characteristics of the phosphor particles during the electrophotographic manufacturing of the screen.Type: GrantFiled: December 21, 1988Date of Patent: May 1, 1990Assignee: RCA Licensing CorporationInventors: Pabitra Datta, Ronald N. Friel
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Patent number: 4416807Abstract: Conductive information discs comprised of conductive particles such as carbon black dispersed in a stable thermoplastic material comprising a homopolymer of styrene, an acrylic acid ester, or a methacrylic acid ester, a copolymer of styrene and acrylonitrile, an acrylic acid ester, or a methacrylic acid ester, or mixtures thereof, is disclosed.Type: GrantFiled: October 14, 1981Date of Patent: November 22, 1983Assignee: RCA CorporationInventors: Pabitra Datta, Ronald N. Friel
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Patent number: 4378310Abstract: An improved molding composition having a high thermal stability, including a vinyl chloride/vinyl acetate copolymer-based resin, sufficient finely divided conductive particles to obtain the desired conductivity, and from 3 to 20 weight percent of the modifying additive BLENDEX 586, which is a three-component blend of polyvinyl chloride, a graft copolymer of acrylonitrile, styrene and polybutadiene, and a copolymer of alpha-methyl styrene and acrylonitrile, as described in U.S. Pat. No. 3,053,800. High density information discs fabricated from this molding composition have improved dimensional stability and increased resistance to environmental temperature changes.Type: GrantFiled: July 28, 1980Date of Patent: March 29, 1983Assignee: RCA CorporationInventors: Pabitra Datta, Nestor A. Arroyo, Ronald N. Friel
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Patent number: 4280941Abstract: A polyvinyl chloride based molding composition containing polymer grafted conductive carbon particles has good processability, low heat distortion temperature and good dispersion of the conductive particles and can be molded to form video discs of improved electrical properties.Type: GrantFiled: May 8, 1980Date of Patent: July 28, 1981Assignee: RCA CorporationInventors: Pabitra Datta, Ronald N. Friel
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Patent number: 4241120Abstract: A polyvinyl chloride based molding composition containing polymer grafted conductive carbon particles has good processability, low heat distortion temperature and good dispersion of the conductive particles and can be molded to form video discs of improved electrical properties.Type: GrantFiled: November 13, 1978Date of Patent: December 23, 1980Assignee: RCA CorporationInventors: Pabitra Datta, Ronald N. Friel