Patents Examined by S. C. Crossan
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Patent number: 5194353Abstract: An electrophotographic photosensitive member comprises an electroconductive support and a photosensitive layer formed thereon.Type: GrantFiled: July 29, 1991Date of Patent: March 16, 1993Assignee: Canon Kabushiki KaishaInventors: Masato Tanaka, Yoshio Kashizaki
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Patent number: 5183721Abstract: An electrophotographic light-sensitive material is disclosed. The light-sensitive material comprises a support having provided thereon a photoconductive layer containing at least inorganic photoconductive particles and a binder resin, wherein the binder comprises a copolymer comprising at least a monofunctional macromonomer (M) having a weight average molecular weight of not more than 2.times.10.sup.4 and a monomer represented by the formula (III) as defined in the specification, the macromonomer (M) comprising at least one polymer component represented by the formulae (IIa) and (IIb) as defined in the specification and at least one polymer component containing at least one polar group, and the macromonomer (M) having a polymerizable double bond group represented by the formula (I) as defined in the specification bonded to only one terminal of the main chain of the polymer. The electrophotographic light-sensitive material has excellent electrostatic characteristics, moisture resistance and durability.Type: GrantFiled: March 20, 1990Date of Patent: February 2, 1993Assignee: Fuji Photo Film Co., Ltd.Inventors: Eiichi Kato, Kazuo Ishii
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Patent number: 5147747Abstract: A low fusing temperature toner powder with good keep and broad fusing latitude characteristics is provided. The toner powder is comprised of polymer particles of a partially carboxylated crystalline polyester and partially carboxylated amorphous polyester that has been crosslinked together at elevated temperature with the aid of an epoxy novolac resin and a crosslinking catalyst.Type: GrantFiled: August 6, 1990Date of Patent: September 15, 1992Assignee: Eastman Kodak CompanyInventors: John C. Wilson, Lawrence P. DeMejo
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Patent number: 5143810Abstract: A magnetic toner for developing an electrostatic image comprises a binder resin and a spherical magnetic powder. The spherical magnetic powder comprises spherical magnetic particles. The spherical magnetic particle has a surface layer having composition different from its core. The surface layer is formed of a ferrite having an oxide of a divalent metal other than iron in an amount of from 1.5 to 13 mol % in terms of divalent metal ion.Type: GrantFiled: May 29, 1990Date of Patent: September 1, 1992Assignee: Canon Kabushiki KaishaInventors: Keita Nozawa, Seiichi Takagi
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Patent number: 5141837Abstract: An electrophotographic coating composition comprising finely-divided photoconductive perylene pigment dispersed in a solvent solution of polymeric binder is prepared by the steps of (1) milling a perylene pigment with milling media comprising inorganic salt and non-conducting particles under shear conditions in the substantial absence of the solvent to provide pigment having a particle size up to 0.2 micrometer, (2) continuing the milling at higher shear at a temperature up to about 50.degree. C., to achieve a perceptible color change of the pigment particles, (3) rapidly reducing the temperature of the milled pigment by at least 10.degree. C., (4) separating the milled pigment from the media and (5) mixing the milled pigment with the solvent solution of polymeric binder to form the coating composition. A very high degree of dispersion of photoconductive perylene pigment in solvent solution of polymeric binder is achieved by this method.Type: GrantFiled: February 23, 1990Date of Patent: August 25, 1992Assignee: Eastman Kodak CompanyInventors: Khe C. Nguyen, William T. Gruenbaum
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Patent number: 5137794Abstract: An electrophotographic photosensitive member having a conductive substrate and a photosensitive layer thereon. The photosensitive layer contains a compound represented by the following formula (1): ##STR1## wherein Ar.sub.1 and Ar.sub.2 are the same or different and are each a substituted or unsubstituted bivalent carbocyclic aromatic group or a substituted or unsubstituted bivalent heterocyclic aromatic group; R.sub.1 and R.sub.2 are each a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group or a substituted or unsubstituted aryl group; and A.sub.1 and A.sub.2 are each a coupler residue having a phenolic hydroxyl group, wherein A.sub.1 and A.sub.2 are the same or different.Type: GrantFiled: June 12, 1991Date of Patent: August 11, 1992Assignee: Canon Kabushiki KaishaInventor: Toshihiro Kikuchi
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Patent number: 5104765Abstract: A process is disclosed for making high resolution copies wherein a toned image is formed on a receiver. First, a uniform coating of clear toner particles is transferred to the surface of a receiver. Next, a latent electrostatic image is developed and transferred to the coated receiver by conventional electrostatic transfer technique.Type: GrantFiled: March 5, 1990Date of Patent: April 14, 1992Assignee: Eastman Kodak CompanyInventors: Arun Chowdry, Dennis R. Kamp, Donald S. Rimai
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Patent number: 5080992Abstract: Coloring fine particles produced by heating spheroidal coloring fine particles with an average fine particle diameter of 1-100 .mu.m obtained by suspension polymerization to a temperature of 30.degree. to 200.degree. C., thereby causing the particles to fuse together in a block without completely destroying the particle interfaces, and then crushing the block to substantially the same average particle diameter of the spheroidal coloring particle before melting, and a toner for developing electrostatic images using the same.Type: GrantFiled: August 29, 1989Date of Patent: January 14, 1992Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.Inventors: Yoshikuni Mori, Hayato Ikeda, Mitsuo Kushino, Nobuaki Urashima, Keiichi Uehara, Masuji Izubayashi, Yoshinori Sano
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Patent number: 5064736Abstract: An electrostatic method is disclosed for providing multicolor imaging from a single toner bath. The toner bath is a blend of individual toners, each of which contains a color precursor different from the others. Also disclosed is a method for the double encapsulation of toner particles to produce toner particles characterized by multiple encapsulation.Type: GrantFiled: December 20, 1989Date of Patent: November 12, 1991Assignee: Olin CorporationInventors: Paul V. Grosso, Feagin A. Wing, Jr., Michael J. Morgan, Renate C. Stegmeier, Roger W. Day, Willard F. Burt
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Patent number: 5063132Abstract: A toner composition and a xerographic process for making lithographic plates using the toner composition is provided. The toner composition can be prepared in the form of a dry powder, a polymeric limited coalescence composition, or an evaporative limited coalescence composition. The toner composition absorbs light in the frequency range of 300 to 450 nm and has a total transmission density of at least about 3 at a stack height of about 10 microns. Positive transparencies are produced with imaged areas formed from the toner composition using conventional photocomposing. The transparencies are then employed for contact exposing of positive-working lithographic plates with light, and the plates are then developed.Type: GrantFiled: November 13, 1989Date of Patent: November 5, 1991Assignee: Eastman Kodak CompanyInventors: Zona R. Pierce, Dinesh Tyagi, John C. Wilson
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Patent number: 5061588Abstract: A dry type toner for electrophotography is disclosed which comprises as the main components (a) a coloring agent; and (b) a polyol resin serving as a binder agent in an effective amount, the polyol resin being prepared by subjecting a bisphenol-type epoxy resin containing epoxy groups, which may contain secondary hydroxyl groups, to reaction steps (1), (2) and (3), or steps (2) and (3), in any sequential combination, until substantially no epoxy groups remain in the polyol resin, wherein the reaction step (1) comprises a step of causing the epoxy groups in the bisphenol-type epoxy resin to react with a primary amine; the reaction step (2) comprising a step of causing the epoxy groups to react with a compound containing one active hydrogen capable of reacting with the epoxy groups; and the reaction step (3) comprising a step of esterifying at least part of the secondary hydroxyl groups or hydroxyl groups produced in the bisphenol-type epoxy resin by reaction step (1) and/or reaction step (2) by use of an esterType: GrantFiled: April 14, 1989Date of Patent: October 29, 1991Assignees: Ricoh Company, Ltd., Petrochemical Industries, Ltd. MitsuiInventors: Hiroyuki Fushimi, Nobuhiro Nakayama, Yasuo Asahina, Mitsuo Aoki, Kayo Makita
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Patent number: 5053305Abstract: A composition for developing electrostatic latent images in electrographic printing or copying machinery is provided in which a toner component is blended with 10 to 40% by weight of a carrier. The toner component includes magnetic toner particles each having magnetic powder bound in a resin, and magnetic particles in admixture with the magnetic toner particles, preferably as an external additive in an amount of 0.1 to 10% by weight.Type: GrantFiled: September 5, 1989Date of Patent: October 1, 1991Assignee: TDK CorporationInventors: Kazuo Aoki, Akira Kakinuma, Megumi Saito, Motohiko Makino
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Patent number: 5051331Abstract: A toner for developing electrostatic latent images includes a binding resin, such as a crosslinked styreneacrylate ester copolymer, and a low-molecular weight olefin copolymer, the low-molecular weight polyolefin copolymer having at least two olefinic repeating units and having two or more peaks of melting at temperatures between 90.degree. C. and 170.degree. C.Type: GrantFiled: December 28, 1989Date of Patent: September 24, 1991Assignee: Canon Kabushiki KaishaInventor: Kiichiro Sakashita
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Patent number: 5049467Abstract: A toner for use in the development of electrostatic latent images containing at least one calix (n) arene compound. The compound is almost colorless, dispersible in the toner resin, and compatible with the toner resin, and does not contain metals, so that the toner obtained has stability against environmental changes and excellent stability on storage. The toner can be used to form images that are clear, the fine lines of which have good reproducibility.Type: GrantFiled: January 26, 1990Date of Patent: September 17, 1991Assignee: Orient Chemical Industries, Ltd.Inventor: Schunichiro Yamanaka
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Patent number: 5035973Abstract: An image forming method includes the steps of forming an electrostatic latent image on an image-carrying body, developing the electrostatic latent image using a developing agent, and transferring the developed image. A compound which reacts with nitrate ions causing an image flow and forms a water-insoluble substance is added on the surface of the image-carrying body, and then a cleaning is performed on the surface of the image-carrying body. The water-insoluble substance is removed from the surface of the image-carrying body, and therefore the image flow is prevented.Type: GrantFiled: November 1, 1988Date of Patent: July 30, 1991Assignee: Kabushiki Kaisha ToshibaInventor: Eiichi Kaga
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Patent number: 5032484Abstract: Toner compositions of toner particles and magnetic carrier particles are provided. The toner particles contain incorporated therein a fatty acid amine derived charge control agent, a polydimethylsiloxane flow control agent and low molecular weight, particulate polyethylineimine particles. The compositions display excellent paper adhering characteristics after heat fusion thereto and excellent carrier developer charging characteristics.Type: GrantFiled: December 27, 1989Date of Patent: July 16, 1991Assignee: Eastman Kodak CompanyInventors: Lawrence P. DeMejo, Joseph A. Pavlisko
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Patent number: 5021310Abstract: An electrophotographic photoreceptor is provided comprising, in sequence:a) a conductive base;b) a carrier transport layer;c) a carrier generation layer comprising a selenium alloy;d) a carrier injection regulating layer having a band gap energy greater than that of the carrier generation layer and comprising selenium and up to about 10 weight % arsenic;e) a thermal expansion relieving layer comprising aresenic and selenium; andf) a surface protective layer comprising arsenic and selenium in an atomic ratio of approximately 2 to 3;wherein the arsenic concentration in the thermal expansion relieving layer gradually increases from a concentration substantially equal to that of the carrier injection regulating layer on a face of the thermal expansion relieving layer adjacent to the carrier injection regulating layer to a concentration substantially equal to that of the surface protective layer on an opposite face of the thermal expansion relieving layer adjacent to the surface protective layer.Type: GrantFiled: June 16, 1989Date of Patent: June 4, 1991Assignee: Fuji Electric Co., Ltd.Inventor: Seizou Kitagawa
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Patent number: 5013625Abstract: A photoreceptor that has at least a subbing layer and a light-sensitive layer formed on an electro-conductive supports is disclosed. The improvement is that said subbing layer is formed of a copolymer comprising ethylene, vinyl acetate and an unsaturated carboxylic acid and/or vinyl alcohol.Type: GrantFiled: February 12, 1990Date of Patent: May 7, 1991Assignee: Konica CorporationInventors: Yoshio Takizawa, Kunio Sigeta, Shigeki Takeuchi, Hiroshi Yoshioka, Yoshihide Fujimaki
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Patent number: 4994340Abstract: A magnetic toner comprising at least a binder resin, a magnetic powder and polyolefine is disclosed. The magnetic toner comprises a Wadel's globularity ranging from 0.4 to 0.8, and polyolefine comprises a content ranging from 10 to 40 weight % on a surface of the toner.Type: GrantFiled: September 18, 1989Date of Patent: February 19, 1991Assignee: Konica CorporationInventors: Hiroshi Yamazaki, Yoko Yamamoto, Hirohiko Seki
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Patent number: 4963451Abstract: 1,2,4,5-Benzoylenebis(anthraquinone[1,2-d]imidazole) compounds represented by following general formula (1) or (2) ##STR1## wherein R and R' each are hydrogen atom, a halogen atom, hydroxyl group, a lower alkyl group, a lower alkoxy group or an aryl group which may be substituted and m and n each are an integer of 1 or 2, and photosensitive members for electrophotography having a photosensitive layer containing them.Type: GrantFiled: September 22, 1989Date of Patent: October 16, 1990Assignee: Sharp Kabushiki KaishaInventors: Satoshi Katayama, Yoshihide Shimoda, Hiroshi Sugimura, Eiji Imada, Shuhei Tsuchimoto