Patents Examined by Rachel L Burney
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Patent number: 7842448Abstract: A method of forming fixed images, including the step of applying a two-component developer containing a carrier and a toner containing a wax and a resin binder containing a crystalline polyester to a two-component development device with a linear speed of from 500 to 5,000 mm/sec, to develop the toner, wherein the crystalline polyester is contained in an amount of from 3 to 40% by weight and the wax in an amount of from 2.5 to 10% by weight, of the toner, and wherein the two-component development device comprises at least three magnet rollers which are arranged closely to each other along the perimeter of a photoconductor, wherein one magnet roller arranged on the uppermost side in the rotational direction of the photoconductor rotates in a direction opposite to the rotational direction of the photoconductor at the point therebetween, and the other magnet rollers rotate in the same direction as the photoconductor at the point therebetween.Type: GrantFiled: January 20, 2006Date of Patent: November 30, 2010Assignee: Kao CorporationInventors: Shinji Moriyama, Yoshihiro Fukushima, Takashi Kubo, Yutaka Kanamaru, Eiji Shirai
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Patent number: 7829252Abstract: An imaging member having an enhanced anti-curl back coating is disclosed. The anti-curl back coating comprises a liquid oligomer. Additionally, a slip agent can also be included. The resulting anti-curl back coating contains little to no residual solvent, shows improved resistance to wear and ozonolysis, and increased lubricity to prevent static charge built-up.Type: GrantFiled: September 7, 2005Date of Patent: November 9, 2010Assignee: Xerox CorporationInventor: Robert C. U. Yu
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Patent number: 7824830Abstract: A coating liquid including an N-alkoxymethylated nylon and a solvent, wherein the N-alkoxymethylated nylon includes one or more ions in an amount of from 200 to 500 ppm based on a weight of the N-alkoxymethylated nylon or one or more alkylamines in an amount of from 15 to 100 ppm based on a weight of the N-alkoxymethylated nylon. A photoreceptor including an electroconductive substrate; a charge blocking layer located overlying the substrate; a moiré preventing layer located overlying the charge blocking layer; and a photosensitive layer located overlying the moiré preventing layer, wherein the charge blocking layer is formed using the coating liquid.Type: GrantFiled: December 16, 2005Date of Patent: November 2, 2010Assignee: Ricoh Company LimitedInventors: Maiko Kondo, Tatsuya Niimi, Naohiro Toda, Takeshi Orito, Nozomu Tamoto, Katsuichi Ohta
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Patent number: 7811736Abstract: An image-fixing method for heat-fixing a toner image, by feeding an transfer medium carrying the toner image between a heating unit heated by an induction-heating process and a pressurizing unit placed to press against the heating unit, wherein the electric resistivity at least of the outermost layer of the heating unit is 10?7 ?m or more and less than 10?2 ?m, and the toner image is formed by using a toner containing an amorphous resin having an ionic concentration in the range of 10?5 to 10?3 mole/g as the binder resin.Type: GrantFiled: March 8, 2005Date of Patent: October 12, 2010Assignee: Fuji Xerox Co., Ltd.Inventor: Takayoshi Aoki
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Patent number: 7803509Abstract: The present invention relates to a crystalline polyester for toner, obtained by a process comprising the step of polymerizing raw material monomers in the presence of a wax, wherein the crystalline polyester has a number-average molecular weight of from 3000 to 10000 and a weight-average molecular weight of from 150000 to 8000000. The toner containing the crystalline polyester of the present invention can be used, for example, for developing electrostatic latent images formed in electrophotography, electrostatic recording method, electrostatic printing method, and the like.Type: GrantFiled: July 18, 2005Date of Patent: September 28, 2010Assignee: Kao CorporationInventors: Shinji Moriyama, Takashi Kubo, Yoshihiro Fukushima
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Patent number: 7799502Abstract: A process including mixing a sulfonated polyester resin, a colorant, and a coagulant; heating the resulting sulfonated polyester mixture; adding a polymetal halide and an anionic latex to form coated toner particles; and heating the coated toner particles is disclosed.Type: GrantFiled: March 31, 2005Date of Patent: September 21, 2010Assignee: Xerox CorporationInventors: Raj Patel, Mike Hawkins, Paul Gerroir, Richard P. N. Veregin
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Patent number: 7794907Abstract: A hydrazone compound capable of realizing an electrophotographic photoreceptor having good electric properties such as good sensitivity and light responsibility, good electric and mechanical durability and good environment stability, is provided. The hydrazone compound is represented by the following general formula (1). The compound is contained in the charge transporting layer of the electrophotographic photoreceptor.Type: GrantFiled: September 7, 2005Date of Patent: September 14, 2010Assignee: Sharp Kabushiki KaishaInventors: Akihiro Kondoh, Takatsugu Obata
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Patent number: 7781137Abstract: A method for producing a high-quality and low-cost laminate type electrophotographic photoreceptor having a coating film of uniform thickness with high efficiency is provided. In the electrophotographic photoreceptor having a laminated structure composed at least of two layers: a charge generating layer containing a charge generating substance and a charge transporting layer containing a charge transporting substance, the charge generating layer is formed by applying a coating solution for forming the charge generating layer onto the conductive support by an ink-jet coating method, and the charge transporting layer is formed by applying a coating solution for forming the charge transporting layer onto the charge generating layer by a roll coating method.Type: GrantFiled: April 26, 2005Date of Patent: August 24, 2010Assignee: Sharp Kabushiki KaishaInventors: Mikio Kakui, Takatsugu Obata, Masanori Kinomoto
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Patent number: 7781134Abstract: A photoreceptor is provided having an electroconductive substrate and a photosensitive layer located overlying the electroconductive substrate, wherein an outermost layer of the photoreceptor contains a binder resin, wherein the binder resin solution satisfies the following relationship 2?(T0?T400)/C wherein T0 represents a initial transmittance (%) at 400 nm of the binder resin solution; T400 represents a transmittance (%) at 400 nm of the binder resin solution which has been allowed to settle for 400 hours under conditions of 23° C. and 40% RH; and C represents the concentration of the binder resin solution; and an image forming method, an image forming apparatus and a process cartridge including the photoreceptor.Type: GrantFiled: December 27, 2005Date of Patent: August 24, 2010Assignee: Ricoh Company, Ltd.Inventors: Takeshi Takada, Takaaki Ikegami, Akihiro Sugino
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Patent number: 7759432Abstract: The emulsion herein is of an epoxy resin having a glass transition temperature of at least about 40° C., wherein the average diameter of the epoxy resin particles in the emulsion is 500 nm or less. The emulsion may include an epoxy resin, a sulfonated polyester resin and a nonionic surfactant. The emulsion may be used to produce a toner particle in an emulsion aggregation method.Type: GrantFiled: October 13, 2005Date of Patent: July 20, 2010Assignee: Xerox CorporationInventors: Ke Zhou, Anna-Karin Eriksson, Guerino G. Sacripante
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Patent number: 7759032Abstract: An electrophotographic imaging member includes a substrate, a charge generating layer, a charge transport layer, and an overcoating layer, where the overcoating layer includes a terphenyl arylamine dissolved or molecularly dispersed in a polymer binder.Type: GrantFiled: December 13, 2005Date of Patent: July 20, 2010Assignee: Xerox CorporationInventors: John F. Yanus, Kenny-Tuan T. Dinh, Markus R. Silvestri, Yuhua Tong, Dale S. Renfer, T. Edwin Freeman, M. John Hinckel
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Patent number: 7723005Abstract: A liquid developer contains an insulation liquid containing as its main component a glyceride of an unsaturated fatty acid, toner particles dispersed in the insulation liquid; and an oxidation polymerization accelerator for accelerating oxidation polymerization reaction of the glyceride during fixing process of the toner particles. The oxidation polymerization accelerator accelerates the oxidation polymerization reaction by supplying oxygen during the fixing process of the toner particles. The liquid developer may further contain an antioxidizing agent. Preferably, the oxidation polymerization accelerator is contained in the insulation liquid being encapsulated.Type: GrantFiled: March 29, 2006Date of Patent: May 25, 2010Assignee: Seiko Epson CorporationInventors: Koji Akioka, Nobuhiro Miyakawa, Takashi Teshima, Satoru Miura
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Patent number: 7718334Abstract: The presently disclosed embodiments relate in general to electrophotographic imaging members, such as layered photoreceptor structures, and processes for making and using the same. More particularly, the embodiments pertain to an additive of porphine or porphine derivatives to eliminate ghosting in specific conditions and improve image quality.Type: GrantFiled: March 20, 2006Date of Patent: May 18, 2010Assignee: Xerox CorporationInventors: Jin Wu, Marc J. Livecchi, James R. Backus, Liang-bih Lin
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Patent number: 7713669Abstract: A toner for developing electrostatic images, comprising a binder resin and a colorant, the binder resin including a crystalline polyester resin and an amorphous resin. When, in differential scanning calorimetry of the toner according to ASTM D3418-8, the temperature of the endothermic peak derived from the crystalline polyester resin in a first heating process is defined as Tm1 (° C.), the endothermic quantity based on the endothermic peak in the first heating process is defined as ?H1 (mW/g), and the endothermic quantity based on the endothermic peak in a second heating process is defined as ?H2 (mW/g), Tm1 is 50 to 80° C., and ?H1 and ?H2 satisfy the relationship represented by the following Formula (1). When the softening temperature of the toner is defined as Tf1/2 (° C.), Tf1/2 is 85 to 135° C. Tm1 and Tf1/2 satisfy the relationship represented by the following Formula (2): 0.35??H2/?H1?0.95??Formula (1) Tf1/2?205?(1.4×Tm1)??Formula (2).Type: GrantFiled: July 25, 2005Date of Patent: May 11, 2010Assignee: Fuji Xerox Co., Ltd.Inventors: Noriyuki Mizutani, Hideo Maehata, Hirokazu Hamano, Hiroyuki Tanaka, Moegi Iguchi, Soichiro Kitagawa, Susumu Yoshino, Yuka Ishihara, Yosuke Tsurumi, Akira Matsumoto, Masaru Takahashi
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Patent number: 7713670Abstract: A developer for an electrophotographic tandem image forming method is provided that contains a toner; and a carrier, wherein the toner has a shape factor SF-1 of from 120 to 160, an average circularity of form 0.93 to 0.98, a weight-average particle diameter (D4) of from 3.0 to 8.0 ?m, and a ratio (D4/Dn) of the weight-average particle diameter (D4) to a number-average particle diameter (Dn) of from 1.01 to 1.20, and wherein the carrier is almost a spherical ferrite coated with a resin wherein alumina is dispersed, which has an average particle diameter of from 20 to 45 ?m and the following formula: (MgO)x(MnO)y(Fe2O3)z wherein x is from 1 to 5 mol %, y is from 5 to 55 mol % and z is from 45 to 55 mol %.Type: GrantFiled: May 11, 2005Date of Patent: May 11, 2010Assignee: Ricoh Company, Ltd.Inventors: Masami Tomita, Tomio Kondou, Masahide Yamashita, Kousuke Suzuki
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Patent number: 7666565Abstract: A method of forming electrophotographic toner. An organic solution containing a polymer resin and a solvent and an aqueous solution containing an anti-coagulant are provided. The aqueous solution is added into the organic solution to form colloidal polymer particles. The colloidal polymer particles are then aggregated, coalesced, and solidified to form toner particles.Type: GrantFiled: August 26, 2005Date of Patent: February 23, 2010Assignee: Sinonar Corp.Inventors: Ming-Huei Liu, Chih-Chia Hung, Fang-Yi Hsu
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Patent number: 7662533Abstract: An image forming method including: forming an electrostatic latent image on an image bearing member; developing the latent image with a toner; transferring the toner image onto a receiving material; and fixing the toner image. The image bearing member includes a substrate, and a charge generation layer, a charge transport layer and a crosslinked charge transport layer, wherein the crosslinked charge transport layer includes a compound obtained from radical polymerizable monomers including a monomer having three or more functional groups and no charge transport structure and a monomer having one functional group and a charge transport structure. The toner includes a binder resin, a colorant, and a release agent, wherein tetrahydrofuran-soluble components of the binder resin have a molecular weight distribution such that at least one peak is observed in a range of from 1,000 to 10,000 and the half-width of the molecular weight distribution curve is not greater than 15,000.Type: GrantFiled: June 24, 2005Date of Patent: February 16, 2010Assignee: Ricoh Company LimitedInventors: Kohichi Ohshima, Yasuo Suzuki, Tetsuro Suzuki, Michitaka Sasaki
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Patent number: 7652128Abstract: A composition including an initiator and an unsaturated sulfopolyester amine resin, and processes for preparing and using thereof.Type: GrantFiled: November 5, 2004Date of Patent: January 26, 2010Assignee: Xerox CorporationInventors: Guerino Sacripante, Ke Zhou
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Patent number: 7642029Abstract: A flexible imaging member which does not require the use of an anti-curl back coating is disclosed herein. The flexible imaging member has a layer comprising two charge transport molecules dispersed in a film-forming polymer binder and an overcoat layer. The first charge transport molecule is a biphenyl amine, terphenyl diamine, or bis(triarylamine) stilbene. The second charge transport molecule is a bis(triarylamine), tri-p-tolylamine, or triphenylamine. The weight ratio of second charge transport molecule to first charge transport molecule is from about 90:10 to about 66:34. Trifluoro acetic acid is also added to the layer containing the charge transport material.Type: GrantFiled: October 28, 2005Date of Patent: January 5, 2010Assignee: Xerox CorporationInventors: Anthony M. Horgan, Robert C. U. Yu, Kathleen M. Carmichael
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Patent number: 7635548Abstract: An electrophotographic imaging member includes a substrate, a photogenerating layer, and an optional overcoating layer, where the photogenerating layer includes a self-assembled carbon nanotube material having pendant charge transport materials.Type: GrantFiled: August 8, 2006Date of Patent: December 22, 2009Assignee: Xerox CorporationInventor: Timothy P. Bender