Patents Examined by Christopher D. Rodee
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Patent number: 6156469Abstract: A developing agent exhibiting satisfactory negative charging characteristics can be obtained by allowing the developing agent to contain a toner, which contains a predetermined 2:1 type metal complex salt dye as a charge control agent or as a coloring agent, and carrier particles represented by general formula (MO).sub.X (Fe.sub.2 O.sub.3).sub.Y, obtained by using a kneaded mixture containing predetermined 2:1 type metal complex salt compound particles and a binder resin to have an average particle diameter of 0.2 .mu.m or less, or by allowing a binder resin to contain in advance a low molecular weight wax in manufacturing a developing agent containing a predetermined 2:1 type metal complex salt compound.Type: GrantFiled: September 17, 1998Date of Patent: December 5, 2000Assignee: Kabushiki Kaisha ToshibaInventor: Shuitsu Sato
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Patent number: 6156466Abstract: The present invention relates to photoconductors which exhibit excellent electrical properties which are not appreciably affected by environmental changes or by repeated use. Having excellent durability during repeated printing, these photoconductors can be used to obtain large quantities of high-quality output images.The photoconductor according to the invention includes a conductive substrate and a photoconductive film on the conductive substrate. The photoconductive film includes a plurality of charge generation and transport layers, wherein each layer contains a phthalocyanine compound described in the specification by chemical formula (I) as a charge generation agent and a charge transport agent dispersed or dissolved into a binder. The concentration of the charge generation agent in an upper layer is higher than in a lower layer.Type: GrantFiled: July 8, 1998Date of Patent: December 5, 2000Assignee: Fuji Electric Co., Ltd.Inventors: Shinichi Tamura, Tadashi Mimura, Yoji Yamada, Tadashi Asakawa, Hiroshi Kimura
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Patent number: 6153345Abstract: Disclosed is a color toner for developing an electrostatic latent image, wherein the colorant comprises a metal complex dye represented by Formula: ##STR1## wherein X is represented by Formula 2. ##STR2## The definitions are specified in the specification.Type: GrantFiled: February 11, 1999Date of Patent: November 28, 2000Assignee: Konica CorporationInventors: Kaori Soeda, Meizo Shirose
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Patent number: 6150064Abstract: A photoconductor for electrophotography includes a photoconductive layer that contains titanyloxyphthalocyanine as a charge generation agent. The concentration of SO.sub.4.sup.2- with respect to the concentration of titanyloxyphthalocyanine is adjusted to be less than or equal to 500 ppm. The photoconductor may be of either a monolayer or a laminate construction. In the case of a laminate type photoconductor, the titanyloxyphthalocyanine is incorporated into the charge generation layer.Type: GrantFiled: April 16, 1998Date of Patent: November 21, 2000Assignee: Fuji Electric Co., Ltd.Inventors: Kazumi Egota, Yoichi Nakamura, Masahide Takano, Hideki Kina, Akira Ootani
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Patent number: 6150065Abstract: Disclosed is a charge transfer material which is highly soluble in a binder resin, does not precipitates crystals and produces no pinhole and also disclosed is an electrophotographic photoreceptor comprising the charge transfer material which comprises a butadiene compound represented by the formula (I): ##STR1## wherein R.sup.1 and R.sup.2, which may be the same or different, respectively represent a lower alkyl group having 1-4 carbon atoms or a phenyl group or benzyl group which may have a substituent and R.sup.3, R.sup.4 and R.sup.5, which may be the same or different, respectively represent a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group having 1-4 carbon atoms or a halogen atom; and a butadiene compound represented by the general formula (II): ##STR2## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.Type: GrantFiled: April 5, 1999Date of Patent: November 21, 2000Assignee: Takasago International CorporationInventors: Tohru Kobayashi, Yoko Aoki, Mamoru Yamada, Yoshimasa Matsushima, Hiroshi Sugiyama, Toshimitsu Hagiwara, Hajime Suzuki
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Patent number: 6146804Abstract: (1) Electrophotographic liquid developer comprising electrically insulating medium liquid and toner dispersed in the medium liquid, wherein the toner has a melt viscosity (.eta.) in a range from 2.times.10.sup.2 poises to 1.times.10.sup.5 poises at 100.degree. C. in a dry state, and has a glass transition temperature of 20.degree. C. or more.(2) Electrophotographic liquid developer comprising electrically insulating medium liquid and toner dispersed in the medium liquid, wherein the toner contains binder resin exhibiting at least one peak in each of ranges of a molecular weight lower than 5000 and of a molecular weight of 5000 or more when detected by a gel permeation chromatography (GPC).Type: GrantFiled: December 23, 1999Date of Patent: November 14, 2000Assignee: Minolta Co., Ltd.Inventors: Hidetoshi Miyamoto, Toshimitsu Fujiwara, Shuji Iino, Masaharu Kanazawa, Seishi Ojima
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Patent number: 6140003Abstract: A toner composition comprised of resin particles, pigment and a charge enhancing additive comprised of a polymer or said resin particles with a charge enhancing moiety chemically attached thereto, and which charge additive is of the formula ##STR1## wherein X is an alkaline, an alkaline earth metal, a metal, or the ammonium cation H.sub.4 N+, R".sub.4 N+ wherein R" is an alkyl or arylalkyl group; R is alkylene, cyclohexyl, bisphenol, bis(alkyloxyl), or oxyalkylene; and R' is an alkylene, an arylene, cycloalkylene group.Type: GrantFiled: April 1, 1994Date of Patent: October 31, 2000Assignee: Xerox CorporationInventors: Guerino G. Sacripante, Richard P. N. Veregin
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Patent number: 6139999Abstract: An electrophotographic imaging member includingat least one photographic imaging layer anda partially electrically conductive overcoat layer includingfinely divided charge injection enabling particles dispersed ina charge transporting continuous matrix including a cross linked polyamide, charge transport molecules and oxidized charge transport molecules, the continuous matrix being formed from a solution selected from the group includinga first solution includingcrosslinkable alcohol soluble polyamide containing methoxy methyl groups attached to amide nitrogen atoms,an acid having a pK.sub.Type: GrantFiled: October 28, 1999Date of Patent: October 31, 2000Assignee: Xerox CorporationInventors: Timothy J. Fuller, Damodar M. Pai, John F. Yanus, Paul J. DeFeo, Anthony T. Ward, Dale S. Renfer, Harold F. Hammond, Merlin E. Scharfe, Markus R. Silvestri, William W. Limburg
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Patent number: 6139997Abstract: An electrophotographic photosensitive member is formed of a support, and a photosensitive layer disposed on the support. The photosensitive layer is characterized by containing an azo pigment having an organic group represented by formula (1) below: ##STR1## wherein X.sub.1, Z.sub.1, k.sub.1, B, A, R.sub.1 and R.sub.2 are defined in the text. The group of the formula (1) may provide at least one of up to 4 azo-substituents of the azo pigment having an entire structure represented byAr.paren open-st.N.dbd.N--Cp) 1-4,wherein Ar denotes an aromatic or heterocyclic core unit, Cp denotes a coupler residue group, and --(N.dbd.N--Cp) denotes such an azo-substituent. The photosensitive member can exhibit good electro-photographic performances including high and stable sensitivity on repetitive use.Type: GrantFiled: March 8, 1999Date of Patent: October 31, 2000Assignee: Canon Kabushiki KaishaInventors: Masato Tanaka, Kouichi Nakata
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Patent number: 6140002Abstract: A binder resin for toners which comprises a styrene-acrylic resin comprising a high molecular weight polymer component and a low molecular weight polymer component, wherein, in terms of the molecular weight distribution as measured by gel permeation chromatography, the high molecular weight polymer component has a first peak in the region of molecular weight 5.times.10.sup.4 to 8.times.10.sup.5 and at least 2 peaks and/or shoulders at the high molecular weight side above the molecular weight of the first peak, as well as a toner containing the resin.Type: GrantFiled: December 19, 1997Date of Patent: October 31, 2000Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Koji Shimizu, Motoshi Inagaki, Yoko Harada, Noriyuki Tajiri
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Patent number: 6136485Abstract: The object of the invention is to provide a highly characteristic and lesser defective image using an electrophotographic photoreceptor which can be produced with a better coating property and which is highly sensitive and hardly loses the electrostatic stability during repeated use. A water-soluble or water/alcohol-soluble polyvinyl acetal and an inorganic pigment are involved in an underlayer provided between a conductive support and a photoconductive layer. Particularly, it is favorable to use titanium oxide as the inorganic pigment, make the ratio of polyvinyl acetal/titanium oxide 1/9-9/1 by weight, make the underlayer 0.5-5 .mu.Type: GrantFiled: November 9, 1998Date of Patent: October 24, 2000Assignee: Sharp Kabushiki KaishaInventors: Kazuya Ishida, Satoshi Katayama, Takahiro Teramoto, Akihiko Kawahara, Kazushige Morita, Tomoko Kanazawa
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Patent number: 6136410Abstract: To enable high density mass storage recording, for an upper magnetic layer, the length of a major axis of metallic magnetic powder, the type of binder, the hardness and particle size of abrasive powder, the condition of kneading, surface roughness and thickness are regulated, for a lower nonmagnetic layer, the length of a major axis of nonmagnetic powder, the ratio of the length of a major axis to that of a minor axis and the type of binder are regulated and further, a method of forming the upper magnetic layer and the lower nonmagnetic layer, the thickness of a nonmagnetic base material and Young's modulus are regulated.Type: GrantFiled: October 3, 1996Date of Patent: October 24, 2000Assignee: Sony CorporationInventors: Kazuhiro Okamoto, Takao Kudo, Yuichi Sasaki, Taro Ohmura
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Patent number: 6132912Abstract: A photoconductive imaging member comprised of a supporting substrate, a layer (1) thereover, a photogenerating layer and a charge transport layer, and wherein said layer (1) is generated from a mixture of a polyhydroxyalkylacrylate, and an amino alkyltrialkoxysilane.Type: GrantFiled: May 27, 1999Date of Patent: October 17, 2000Assignee: Xerox CorporationInventors: Timothy J. Fuller, Damodar M. Pai, John F. Yanus, Markus R. Silvestri, Huoy-Jen Yuh, John S. Chambers, Harold F. Hammond, Susan M. Vandusen, Dennis J. Prosser, Kathleen M. Carmichael, Robert C. U. Yu, Neil S. Patterson
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Patent number: 6132924Abstract: A process for the preparation of toner comprising mixing a colorant, a latex, and two coagulants, followed by aggregation and coalescence.Type: GrantFiled: October 15, 1998Date of Patent: October 17, 2000Assignee: Xerox CorporationInventors: Raj D. Patel, Michael A. Hopper, Richard P. N. Veregin
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Patent number: 6130021Abstract: A process involving the mixing of a latex emulsion containing resin and a surfactant with a colorant dispersion containing a nonionic surfactant, and a polymeric additive and adjusting the resulting mixture pH to less than about 4 by the addition of an acid and thereafter heating at a temperature below about, or equal to about the glass transition temperature (Tg) of the latex resin, subsequently heating at a temperature above about, or about equal to the Tg of the latex resin, cooling to about room temperature, and isolating the toner product.Type: GrantFiled: April 13, 1998Date of Patent: October 10, 2000Assignee: Xerox CorporationInventors: Raj D. Patel, Michael A. Hopper
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Patent number: 6130019Abstract: The present invention relates to a binder carrier comprising at least magnetic particles and a binder resin. The binder resin contains a thermoplastic silicone-modified acrylic resin which is a copolymer of a polydiorgano-siloxane macromer having an acrylic functional group and a radical-polymerizable organic monomer.The binder carrier of the present invention a long-life binder carrier which eliminates the possibility of carrier deterioration due to toner components, such as a charge-controlling agent and an after-treatment agent, and which is less liable to deteriorate in its chargeability.Type: GrantFiled: December 1, 1998Date of Patent: October 10, 2000Assignee: Minolta Co., Ltd.Inventors: Tomoharu Nishikawa, Makoto Kobayashi, Koichi Takenaka, Hideaki Yasunaga, Hiroyuki Fukuda, Haruhiko Furukawa, Hiroshi Ueki, Yoshitsugu Morita
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Patent number: 6127077Abstract: A photoreceptor having a substrate, including: (a) a charge generating layer; (b) a first charge transport layer having a first charge carrier mobility value; and (c) a second charge transport layer having a second charge carrier mobility value, wherein the first charge transport layer is closer to the charge generating layer than the second charge transport layer and the second charge transport layer is contiguous to the first charge transport layer, wherein the second charge carrier mobility value is higher than the first charge carrier mobility value.Type: GrantFiled: September 14, 1998Date of Patent: October 3, 2000Assignee: Xerox CorporationInventors: Damodar M. Pai, Chu-Heng Liu, John F. Yanus, Timothy J. Fuller, Markus R. Silvestri
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Patent number: 6124067Abstract: A magnetic carrier constituting a two-component developer for use in an electrophotographic image forming method is formed of a carrier core comprising a first resin and magnetic fine particles dispersed in the first resin, and a second resin surface-coating the carrier core. (a) The magnetic carrier has a true specific gravity of 2.5-4.5, a magnetization .sigma..sub.1000 as measured in a magnetic field of 1000.times.(10.sup.3 /4.pi.).multidot.A/m (1000 oersted) of 15-60 Am.sup.2 /kg (emu/g), a residual magnetization .sigma..sub.r of 0.1-20 Am.sup.2 /kg (emu/g) and a resistivity of 5.times.10.sup.11 -5.times.10.sup.15 ohm.cm. (b) The first resin has a polymer chain including a methylene unit (--CH.sub.2 --). (c) The second resin has at least a fluoro-alkyl unit, a methylene unit (--CH.sub.2 --) and an ester unit.Type: GrantFiled: July 22, 1999Date of Patent: September 26, 2000Assignee: Canon Kabushiki KaishaInventors: Yushi Mikuriya, Kenji Okado, Kazumi Yoshizaki
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Patent number: 6120961Abstract: A toner for developing an electrostatic image includes a binder resin, a colorant and a wax. The toner shows heat-absorption characteristics represented by a DSC heat-absorption curve obtained on temperature increase in a temperature range of 30-150.degree. C. by a differential scanning colorimeter (DSC). The DSC heat-absorption curve shows a maximum heat-absorption peak (P1) in a temperature range of 70-90.degree. C. The DSC curve also provides a differential curve showing a first maximum (Max1) on a lowest temperature side at a temperature (T1) of 50-65.degree. C., showing a second maximum (Max2) on a next lowest temperature side at a temperature (T2) of 65-85.degree. C., and showing a minimum (Min1) on a highest temperature side at a temperature (T3) of at least 95.degree. C. Because of the DSC heat-absorption characteristics, the toner exhibits excellent fixability (including anti-offset characteristic) over a wide temperature range and excellent continuous image forming characteristic.Type: GrantFiled: September 26, 1997Date of Patent: September 19, 2000Assignee: Canon Kabushiki KaishaInventors: Hirohide Tanikawa, Masami Fujimoto, Tsutomu Onuma, Hiroyuki Fujikawa
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Patent number: 6120916Abstract: A composite magnetic material showing reduced losses and reduced permeability when it is subjected to a magnetic field at frequencies below approximately 100 MHz. It comprises magnetic particles in the form of wafers dispersed in a dielectric binder. The polycrystalline magnetic ceramic wafers are oriented so that their main faces are substantially parallel to the magnetic field.Application especially to cores of inductors or transformers.Type: GrantFiled: September 9, 1996Date of Patent: September 19, 2000Assignee: Thomson-CSFInventors: Jean-Pierre Delvinquier, Richard Lebourgeois, Michel Pate, Claude Rohart