Patents by Inventor Charles M. Wetzel
Charles M. Wetzel 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: 5474867Abstract: In accordance with the present invention, a method of electro-photographically manufacturing a luminescent screen assembly for a color CRT 10 on an interior surface of a faceplate panel 12 is described. A volatilizable, organic conductive (OC) layer 32 is provided on the interior surface of the panel and a volatilizable, organic photoconductive (OPC) layer 34 overlies the OC layer. The method includes the steps of: establishing a substantially uniform electrostatic charge on the OPC layer; exposing selected areas of the OPC layer to visible light to affect the charge thereon; developing the selected areas of the OPC layer with a triboelectrically charged dry-powdered, screen structure materials; fixing the screen structure materials to the underlying OPC layer with a suitable fixative; filming the screen structure materials; aluminizing the screen; and baking the aluminized screen.Type: GrantFiled: September 16, 1994Date of Patent: December 12, 1995Assignee: Thomson Consumer Electronics, Inc.Inventors: Peter M. Ritt, Charles M. Wetzel, Harry R. Stork, John J. Moscony
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Patent number: 5156770Abstract: A solution for making a wear-resistant conductive contact patch for a faceplate panel of a color CRT which facilitates the electrophotographic manufacturing of a luminescent screen on the panel consists essentially of, in weight percent, solvent 22 to 70, conductive material 62 to 21, and the balance being other compatible additives.Type: GrantFiled: June 26, 1990Date of Patent: October 20, 1992Assignee: Thomson Consumer Electronics, Inc.Inventors: Charles M. Wetzel, Peter M. Ritt, Owen H. Roberts, Jr., Harry R. Stork
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Patent number: 5151337Abstract: The method of electrophotographically manufacturing a luminescent screen on a substrate of a color CRT, according to the present invention, includes the steps of forming a photoreceptor by sequentially coating the substrate to form 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 by the application of suitable triboelectrically charged, dry-powdered screen structure materials. The improved process provides at least one wear-resistant, conductive contact patch on a peripheral portion of a surface of the substrate. The contact patch has a first portion which underlies at least one of the layers of the photoreceptor and is in electrical contact with the conductive layer, and a second portion which extends from the photoreceptor.Type: GrantFiled: June 26, 1990Date of Patent: September 29, 1992Assignee: RCA Thomson Licensing Corp.Inventors: Charles M. Wetzel, Peter M. Ritt, Owen H. Roberts, Jr., Harry R. Stork
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Patent number: 4765743Abstract: A method of inspecting a pattern of elements on a working plate includes producing a negative copy of the working plate and aligning the negative copy with a positive inspection plate having elements slightly larger than the elements of the working plate whereby flaws are revealed as light transmissive spots. The working plate and a negative inspection plate, having the elements slightly smaller than the elements of the working plate, are aligned and flaws are revealed as light transmissive spots.Type: GrantFiled: March 10, 1987Date of Patent: August 23, 1988Assignee: RCA Licensing CorporationInventors: Frank S. Krufka, Charles M. Wetzel
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Patent number: 4669871Abstract: A method and apparatus for exposing a layer of photoresist on a sheet includes positioning the sheet in a vacuum printing frame comprising a glass photographic printing plate carrying an opaque master pattern of metal or metal oxide on a central area of the printing plate. A light transmissive rubbery material is patterned in such a fashion as to overlie the opaque portions of the master pattern and provide a continuous path between the islands overlying the opaque master pattern. The rubbery material also extends in the peripheral area of the photographic printing plate and a plurality of mesas separated by channels are formed in this peripheral area. The channels have a width substantially greater than the path width formed between adjacent islands of rubbery material overlying the opaque portions of the pattern. The peripheral channels facilitate the evacuation of the plate and reduce evacuation time.Type: GrantFiled: August 1, 1986Date of Patent: June 2, 1987Assignee: RCA CorporationInventors: Charles M. Wetzel, John J. Moscony, Thomas J. Michielutti, Dean T. Deibler
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Patent number: 4664996Abstract: A method for exposing a layer of photoresist on a sheet includes positioning the sheet in a vacuum printing frame comprising a glass plate carrying an opaque master pattern of metal or metal oxide. With the pattern opposite the coating, the frame is evacuated and the layer is exposed. The pattern has a substantially-uniform thickness in the range of about 0.5.+-.0.2 micrometer. To reduce the times for evacuating and devacuating the frame, the pattern side of the glass plate carries an array of light-transparent islands up to about 3.0-micrometer thick. An overcoating of wax on the islands is a further aid.Type: GrantFiled: December 23, 1985Date of Patent: May 12, 1987Assignee: RCA CorporationInventors: John J. Moscony, Thomas J. Michielutti, Charles M. Wetzel
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Patent number: 4656107Abstract: A method for exposing a layer of photoresist on a sheet includes positioning the sheet in a vacuum printing frame comprising a glass plate carrying an opaque master pattern of metal or metal oxide. With the pattern opposite the coating, the frame is evacuated and the layer is exposed. The pattern has a substantially-uniform thickness in the range of about 0.5.+-.0.2 micrometer. To reduce the times for evacuating and devacuating the frame, the pattern side of the glass plate carries an array of light-transparent islands up to about 3.0-micrometer thick. An overcoating of wax on the islands is a further aid.Type: GrantFiled: December 23, 1985Date of Patent: April 7, 1987Assignee: RCA CorporationInventors: John J. Moscony, Thomas J. Michielutti, Charles M. Wetzel
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Patent number: 4588676Abstract: A method for exposing a layer of photoresist on a sheet includes positioning the sheet in a vacuum printing frame comprising a glass plate carrying an opaque master pattern of metal or metal oxide. With the pattern opposite the coating, the frame is evacuated and the layer is exposed. The pattern has a substantially-uniform thickness in the range of about 0.5.+-.0.2 micrometer. To reduce the times for evacuating and devacuating the frame, the pattern side of the glass plate carries an array of light-transparent islands up to about 3.0-micrometer thick. An overcoating of wax on the islands is a further aid.Type: GrantFiled: June 24, 1983Date of Patent: May 13, 1986Assignee: RCA CorporationInventors: John J. Moscony, Thomas J. Michielutti, Charles M. Wetzel