Patents Examined by Jeffrey A. Lindeman
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Patent number: 4965172Abstract: This invention concerns a method for color development of a surface having imagewise tacky and nontacky image areas which comprises(a) applying a dry nonelectroscopic toner to the image-bearing surface;(b) distributing the toner particles over the image surface whereby the distributed toner particles become embedded solely in the tacky image areas; and(c) physically removing toner particles from the nontacky areas which are left substantially free of the toner particles, the improvement wherein high resolution images having higher toned optical density with improved color purity are obtained using a dry nonelectroscopic humidity resistant toner having a size distribution within the range from about 0.2 micron to about 10 microns, not more than 10% of the toner being below 0.Type: GrantFiled: December 22, 1988Date of Patent: October 23, 1990Assignee: E. I. du Pont de Nemours and CompanyInventor: Howard Matrick
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Patent number: 4962008Abstract: An electrophotographic photosensitive member has a photosensitive layer on a conductive substrate, wherein a surface layer of said photosensitive member contains solid lubricant and silicone oil.Type: GrantFiled: July 27, 1988Date of Patent: October 9, 1990Assignee: Canon Kabushiki KaishaInventors: Tomohiro Kimura, Yoichi Kawamorita
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Patent number: 4960666Abstract: A toner and developer composition comprised of polysilylenes, poly(germylenes), or mixtures thereof.Type: GrantFiled: February 27, 1989Date of Patent: October 2, 1990Assignee: Xerox CorporationInventors: Ronald J. Weagley, Timothy J. Fuller, Michael J. Levy
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Patent number: 4959290Abstract: Indenylidene compounds, which are useful not only as the photoconductive material for electrophotography, but also as a charge transporting material employed in a function-separating type photoconductor in which an organic or inorganic pigment is used as a charge generating material, and an electrophotographic photoconductor containing at least one of the above indenylidene compounds in a photoconductive layer thereof, are disclosed.Type: GrantFiled: December 8, 1988Date of Patent: September 25, 1990Assignee: Ricoh Company, Ltd.Inventors: Tamotsu Aruga, Masaomi Sasaki, Mitsuru Hashimoto
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Patent number: 4956258Abstract: A toner for developing latent electrostatic images is disclosed, which comprises a binder resin comprising a component selected from the group consisting of: (1) a mixture of the ternary copolymers of styrene, methyl acrylate, and ethyl acrylate, (2) a mixture of the binary copolymers of two monomers from among the monomers of styrene, methyl acrylate, and ethyl acrylate and homopolymers containing the remaining monomer or the copolymers of that monomer and the other monomers, and (3) a mixture of the respective homopolymers.Type: GrantFiled: May 11, 1988Date of Patent: September 11, 1990Assignee: Ricoh Company, Ltd.Inventors: Yoichiro Watanabe, Tetsuo Isoda, Mitsuo Aoki
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Patent number: 4954406Abstract: In an electrophotographic plate, that having an undercoating layer with smooth surface when observed by using a scanning electron microscope and an electric conductivity of at least 2.times.10.sup.-14 .OMEGA..sup.-1 .multidot.cm.sup.-1 between an electroconductive substrate and a photosensitive layer is improved in electrophotographic properties which are hardly changed by changes of circumstances.Type: GrantFiled: November 1, 1988Date of Patent: September 4, 1990Assignee: Hitachi Chemical Company, Ltd.Inventors: Keiichi Endo, Yasushi Shinbo, Akira Kageyama, Yasuo Katsuya, Chihiro Kato, Masato Fukasawa, Makoto Sekine
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Patent number: 4952477Abstract: A toner composition comprised of resin particles selected from the group consisting of a semicrystalline polyolefin and copolymers thereof which a melting point of from about 50.degree. C. to about 100.degree. C., and pigment particles.Type: GrantFiled: August 12, 1988Date of Patent: August 28, 1990Assignee: Xerox CorporationInventors: Timothy J. Fuller, Thomas W. Smith, William M. Prest, Jr., Robert A. Nelson, Kathleen M. McGrane, Suresh K. Ahuja
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Patent number: 4952470Abstract: An electrophotographic photosensitive member having improved anti-oxidation properties by ozone, comprising a conductive substrate, disposed thereon, a photosensitive layer which includes, as principal constituents, a charge generating material and a charge transporting material, wherein the photosensitive layer contains at least one type of compound selected from a group of those represented by any of the following [A] through [D]:[A] Compounds represented by the following general formula [I]; ##STR1## [B] Bisspiroindene compounds represented by the following general formula [II]; ##STR2## [C] Bisspiroindene compounds represented by the following general formula [III]; ##STR3## [D] Compounds having in the molecular structure thereof at least one structure selected from the following groups; ##STR4## [wherein R represents a hydrogen atom, or organic substituent group.Type: GrantFiled: April 21, 1988Date of Patent: August 28, 1990Assignee: Konica CorporationInventors: Kiyoshi Tamaki, Koichi Kudoh, Yoshihiko Etoh, Yoshiaki Takei
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Patent number: 4950570Abstract: Disclosed in an image-forming process which comprises arranging two electrode surfaces, at least one having a curvature face and at least the other being transparent, to confront each other, forming a layer of a photosensitive toner on one of the electrode surfaces, applying a bias voltage so that the polarity of the toner layer-supporting electrode surface is the same as the polarity of charges on the toner and the polarity of the confronting electrode surface is reverse to the polarity of charges on the toner, irradiating the toner layer with light at a part where both the electrode surfaces are contacted with each other through the photosensitive toner layer, and transferring the unexposed toner toward the confronting electrode surface.Type: GrantFiled: November 28, 1988Date of Patent: August 21, 1990Assignee: MITA Industrial Co., Ltd.Inventors: Yumiko Sano, Kazuhito Takaoka, Yosinobu Umetani
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Patent number: 4946753Abstract: Liquid toners are generally recognized as being capable of providing sharper electrophotographic images, but have been found to provide less than desirable results in multicolor imaging processes. The selection of a unique combination of (a) the ratio of conductivities between the toner liquid and the total toner composition, and (b) the zeta potential of the toner particles in the carrier liquid have been found to provide unique benefits to the quality of the liquid tone multicolor images.Type: GrantFiled: December 2, 1988Date of Patent: August 7, 1990Assignee: Minnesota Mining and Manufacturing CompanyInventors: Mohamed A. Elmasry, Gregory L. Zwadlo, Kevin M. Kednee
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Patent number: 4939056Abstract: This invention provides a photosensitive member with a surface protector layer. The surface protective layer comprises a resin layer and an amorphous carbon layer. The surface protective layer of the invention is effective for a soft photoconductive layer, for example, an inorganic photoconductive layer such as a selenium layer, a selenium-arsenic, selenium-tellurium layer, and an organic photoconductive layer. The surface protective layer does not deteriorate the photosensitive properties. The photosensitive layer of the invention is excellent in durability and resistance to peeling off.Type: GrantFiled: September 23, 1988Date of Patent: July 3, 1990Assignee: Minolta Camera Kabushiki KaishaInventors: Hideo Hotomi, Izumi Osawa, Kenji Masaki, Hideaki Ueda
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Patent number: 4935324Abstract: A process of imaging which comprises (1) generating an image; (2) developing the image formed with a single component pressure fixable toner composition with a resistivity of from about 10.sup.4 to about 10.sup.7 ohm-cm, and comprised of resin particles, magnetite, and a release fluid therein, which toner contains conductive particles on the surface thereof; (3) transferring the developed image to a suitable substrate; and (4) fixing the image thereto by pressure exerting a force of from about 200 to about 400 pounds per linear inch.Type: GrantFiled: July 17, 1989Date of Patent: June 19, 1990Assignee: Xerox CorporationInventors: Bernard Grushkin, Hui Chang, John G. Ruhland
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Patent number: 4931370Abstract: A color toner composition for developing electrostatic images comprises a coloring agent and a binder resin, wherein the binder resin is a vinyl-modified polyester resin obtained by graft polymerizing(a) a vinyl monomer containing an aromatic vinyl monomer and an amino group-containing vinyl monomer to(b) an unsaturated polyester comprising at least aliphatic unsaturated dibasic acid and polyhydric alcohol having a weight average molecular weight of about 5,000 to 15,000, and the component (b) constitutes at least 50% by weight of the vinyl-modified polyester resin and the amino group-containing vinyl monomer constitutes 2 to 20% by weight of the vinyl-modified polyester resin.Type: GrantFiled: December 14, 1988Date of Patent: June 5, 1990Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Shinji Amaya, Yoshiyuki Iwanari, Kinji Shinzo, Toshiro Kogawara, Syuuichi Yamazaki, Seiichi Shimizu, Kazuya Kuriyama
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Patent number: 4929528Abstract: A carrier for a developer comprising a core material coated with a coating material consisting essentially of a copolymer of vinylidene fluoride and trifluoroethylene or hexafluoropropylene is disclosed. The carrier causes neither fog generation in the initial stage of running nor contamination of a developing machine because of its high rate of charge increase and satisfactory resistance to surface contamination, and exhibits excellent adhesion between the core material and the coating material.Type: GrantFiled: November 7, 1988Date of Patent: May 29, 1990Assignee: Fuji Xerox Co., Ltd.Inventors: Masayoshi Shinoki, Masahiro Takagi, Ikutaroh Nagatsuka, Koichi Kumashiro, Takayoshi Aoki, Masayuki Takeda
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Patent number: 4929527Abstract: A photoconductive composition which exhibits excellent dark reduction retention, excellent sensitivity to radiation from the near infrared region to the infrared region as well as excellent long-term stability, is comprised of an inorganic photoconductor, a cyclic acid anhydride and a spectral sensitizing dye dispersed in a binding resin. A laser beam scanning exposure can be performed on said composition to produce electrophotographic images.Type: GrantFiled: April 22, 1988Date of Patent: May 29, 1990Assignee: Fuji Photo Film Co., Ltd.Inventors: Eiichi Kato, Shigeru Ohno, Kazuo Ishii, Ryosuke Itakura
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Patent number: 4927725Abstract: A method of making a reproduction copy of an image or a document by electrophotography wherein high print density portions of an original image are developed and transferred onto a recording medium before low print density portions of the original image are developed and transferred onto the recording medium. The original image is multiply scanned under successive, controlled conditions to produce a series of latent images, each of which represents a print density component of the original image. Each latent image is developed and transferred onto the recording medium to produce a composite print density and gradation which closely approaches the print density and gradation of the original document or a predetermined density and gradation.Type: GrantFiled: December 8, 1988Date of Patent: May 22, 1990Assignee: Fuji Xerox Co., Ltd.Inventors: Hiroo Nishide, Shintaro Kaneko
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Patent number: 4925765Abstract: Negatively chargeable toner containing block copolymers for electrostatic reprography, giving improved compatibility with the toner resin and higher triboelectric charging. Preferred are block copolymers of styrene, methyl methacrylate and butyl methacrylate as one block and salts or esters of methacrylic acid or acrylic acid as the other block in the copolymer.Type: GrantFiled: December 23, 1988Date of Patent: May 15, 1990Assignee: E. I. Du Pont de Nemours and CompanyInventor: Dennis G. Madeleine
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Patent number: 4925764Abstract: Positively chargeable toner containing block copolymers for electrostatic reprography, giving improved compatibility with the toner resin. Preferred are block copolymers of styrene with methyl methacrylate and butyl methacrylate as one block and dimethylaminoethyl methacrylate as the other block, quaternized with methyl tosylate or benzyl chloride.Type: GrantFiled: December 23, 1988Date of Patent: May 15, 1990Assignee: E. I. Du Pont de Nemours & Co.Inventors: Dennis G. Madeleine, Carol A. Senkler, Loretta A. Grezzo Page
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Patent number: 4925762Abstract: Carriers for a two-component dry developer are based on a ferrite or iron-containing core which carries a metal oxide layer consisting of reaction products deposited in the gas phase.The carriers according to the invention have abrasion-resistant metal oxide layers which permit electrostatic charging in both directions. By adjusting the thickness of the metal oxide layer, the electrical conductivity can be altered.Type: GrantFiled: August 17, 1988Date of Patent: May 15, 1990Assignee: BASF AktiengesellschaftInventors: Werner Ostertag, Erwin Czech, Franz-Ulrich Schmitt, Detlef Schulze-Hagenest
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Patent number: RE33355Abstract: Disclosed herein is an agent for absorbing and releasing water vapor, which comprises a homopolymer of at least one monomer selected from specific N-alkyl- or N-alkylene-substituted acrylamides and methacrylamides, a copolymer of two or more of the acrylamides and methacrylamides, a copolymer of said at least one monomer with one or more monomers other than the acrylamides and methacrylamides and copolymerizable therewith, or a water-insolubilized product of the homopolymer or either one of the copolymers. The above agent has broad utility for humidity control of gases, humidity control in green houses and prevention of fogging on surfaces of transparent materials, as humidity sensors and dew sensors, etc.Type: GrantFiled: May 16, 1988Date of Patent: September 25, 1990Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hiroshi Itoh, Toshimi Nakagawa, Atsuhiko Nitta, Tomio Tanaka, Hideo Kamio, Ryosuke Enoshita, Tamotu Uejima, Takahiro Ouchi, Kazuki Abe, Sadao Kobayashi