Patents by Inventor Tetsu Torigoe
Tetsu Torigoe 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: 7348119Abstract: The present invention provides a toner for developing an electrostatic latent image including: toner mother particles containing a binder resin and a colorant; and manganese compound particles having a ?-type crystalline structure, the production method thereof, and a developer containing the toner.Type: GrantFiled: June 28, 2005Date of Patent: March 25, 2008Assignee: Fuji Xerox Co., Ltd.Inventors: Tetsu Torigoe, Noriyoshi Takahashi, Teruo Sakai, legal representative, Emi Takahashi, Teigen Ri, Sueko Sakai
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Publication number: 20060210901Abstract: The present invention provides a toner for developing an electrostatic latent image including: toner mother particles containing a binder resin and a colorant; and manganese compound particles having a ?-type crystalline structure, the production method thereof, and a developer containing the toner.Type: ApplicationFiled: June 28, 2005Publication date: September 21, 2006Applicant: FUJI XEROX CO., LTD.Inventors: Tetsu Torigoe, Noriyoshi Takahashi, Sueko Sakai, Teruo Sakai, Emi Takahashi, Teigen Ri
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Publication number: 20060115757Abstract: A toner for development of an electrostatic latent image, comprises: a binder resin; a colorant; and a release agent, wherein the binder resin has a weight average molecular weight of 20,000 to 40,000, and when a carbon content and a sulfur content of the toner measured using X-ray fluorescence are represented by [C] % and [S] %, respectively, [S]/[C] satisfies expression (1): 0.0002?[S]/[C]?0.0030 ??(1).Type: ApplicationFiled: May 26, 2005Publication date: June 1, 2006Applicant: FUJI XEROX CO., LTD.Inventors: Emi Takahashi, Noriyoshi Takahashi, Sueko Sakai, Teruo Sakai, Tetsu Torigoe, Teigen Ri
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Patent number: 5891600Abstract: The present invention provides a mono-component developer comprising toner particles containing a binding resin, a colorant and an additive and a method of forming images by use thereof. In the present invention said additive is preferably a titanium compound prepared by through the reaction between TiO(OH).sub.2 and a silane compound or through the reaction between TiO(OH).sub.2 and a silicone oil. The specific gravity of the said titanium compound is in the range of 2.8 to 3.6. The average particle diameter thereof is in the range of 10 to 70 nm. The said toner particle is preferably a non-magnetic particle. By making use of the mono-component developer and the method for forming an image using it, charging of the toner, and carriage of the toner can be stabilized over a long period of time, and stable image formation can be obtained.Type: GrantFiled: October 9, 1997Date of Patent: April 6, 1999Assignee: Fuji Xerox Co., Ltd.Inventors: Hiroyoshi Okuno, Etsuo Tominaga, Toyofumi Inoue, Tetsu Torigoe, Hiroe Okuyama, Takahisa Fujii, Koutarou Yoshihara, Masahiro Uchida, Hiroshi Nakazawa, Chiaki Suzuki, Yoshifumi Iida
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Patent number: 5849451Abstract: An electrophotographic dry toner comprising toner particles having externally added thereto fine particles of an inorganic compound having been surface treated with an amphoteric surface active agent. The toner is excellent in fluidity, anti-caking properties, charging properties, and environmental stability and provides excellent images free from defects such as black spots.Type: GrantFiled: July 17, 1997Date of Patent: December 15, 1998Assignee: Fuji Xerox Co., Ltd.Inventors: Yuka Ishihara, Chiaki Suzuki, Tetsu Torigoe, Atuhiko Eguchi, Takayoshi Aoki
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Patent number: 5827631Abstract: A non-magnetic one-component developer comprising a binder resin, a colorant and a charge controlling agent, the binder resin being a polyester resin which has a number average molecular weight of from 2,500 to 3,500, a weight average molecular weight of from 8,000 to 15,000 and a softening point of from 110.degree. C. to 130.degree. C., and which is substantially free from an ingredient insoluble in tetrahydrofuran, and the charge controlling agent comprising a metal complex salt compound represented by the following formula (1): ##STR1## wherein M represents a metal element selected from the group consisting of zinc, iron, nickel and cobalt, and R.sup.1 and R.sup.2 each represents a hydrogen atom or an alkyl group having from 1 to 6 carbon atoms.Type: GrantFiled: February 5, 1997Date of Patent: October 27, 1998Assignee: Fuji Xerox Co., Ltd.Inventors: Koutarou Yoshihara, Seiichi Takagi, Toyofumi Inoue, Hiroyoshi Okuno, Tetsu Torigoe, Hiroe Okuyama, Masahiro Uchida
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Patent number: 5738966Abstract: A negatively electrifiable, non-magnetic and single component developer comprising a binder resin, a carbon black and a charge control agent, wherein the carbon black has an average primary particle diameter of 20 to 50 nm and a pH of 2 to 5, and the charge control agent comprises a compound represented by the following formula: ##STR1## wherein M represents a metal atom selected from the group consisting of zinc, iron, nickel and cobalt, and R.sub.1 and R.sub.2 each represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. An image forming process using the developer is also disclosed. This one-component developer, which is suitable for use as a black toner in color image formation, can be stably charged and transported over long to give images free from fogging and having evenness of density and hardly poses problems such as dirts and color mixing over long.Type: GrantFiled: December 3, 1996Date of Patent: April 14, 1998Assignee: Fuji Xerox Co., Ltd.Inventors: Hiroyoshi Okuno, Toyofumi Inoue, Tetsu Torigoe, Hiroe Okuyama, Koutarou Yoshihara, Masahiro Uchida
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Patent number: 5643705Abstract: The present invention provides a toner for developing an electrostatic image which inhibits the filming of a wax on the development sleeve and photoreceptor to obtain a stable image. The present invention also provides a toner for developing an electrostatic image which provides a practically sufficiently wide fixing latitude. The present invention further provides an image formation process for forming a copied image with an excellent dot reproducibility, fine line reproducibility and gradation. A novel toner for developing an electrostatic image is provided, which comprises a particulate toner containing a polyolefin wax and a modified polyolefin wax, wherein the average diameter of wax particles dispersed in the particulate toner is not more than 0.5 .mu.m and the amount of wax exposed on the surface of said particulate toner is from 40 to 65% by weight. The particulate toner may comprise a finely divided magnetic powder in an amount of from 30 to 70% by weight.Type: GrantFiled: September 28, 1995Date of Patent: July 1, 1997Assignee: Fuji Xerox Co., Ltd.Inventors: Satoshi Inoue, Chiaki Suzuki, Tetsu Torigoe, Shuji Sato, Takahisa Fujii
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Patent number: 5612159Abstract: A toner composition for electrostatic charge development having high cleaning property and inhibiting wear of a photoreceptor, filming and deletion. The toner composition comprises toner particles and fluorine-containing cerium oxide fine particles added to the toner particles. The fluorine content of the fluorine-containing cerium oxide fine particles is from 0.1 to 10% by weight. The toner composition is used in an image forming process comprising the steps of (a) charging a latent image carrier, (b) forming an electrostatic latent image on the latent image carrier, (c) developing the electrostatic latent images with a developing agent to form a toner image, (d) transferring the resulting toner image to a receiving material, and (e) removing a toner remaining on the latent image carrier.Type: GrantFiled: August 24, 1995Date of Patent: March 18, 1997Assignee: Fuji Xerox Co., Ltd.Inventors: Shuji Sato, Chiaki Suzuki, Tetsu Torigoe, Satoshi Inoue, Takahisa Fujii
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Patent number: 5612160Abstract: An electrostatic charge developing toner composition comprising (i) toner particles containing a low-molecular weight polypropylene wax and/or a low-molecular weight polyethylene wax, having a volume average particle size of from 4 to 9 .mu.m, and an exposed amount (X% by weight) of the wax on the surface of the toner in the range of 40.ltoreq.X.ltoreq.65, and (ii) abrasive fine particles having an average particle size of from 0.5 to 5.5 .mu.m, and an image-forming process using the toner.By the toner composition, the occurrence of filming with the wax in the toner particles is prevented and images excellent in the development stability with the passage of time can be formed.Type: GrantFiled: September 5, 1995Date of Patent: March 18, 1997Assignee: Fuji Xerox Co., Ltd.Inventors: Satoshi Inoue, Chiaki Suzuki, Tetsu Torigoe, Shuji Sato, Takahisa Fujii
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Patent number: 5482806Abstract: A dry developer composition for an electrostatic latent image is disclosed. The developer composition comprises a magnetic powder-dispersed type carrier comprising a binder resin having dispersed therein a magnetic powder and a toner having adhered thereto inorganic oxide fine particles, wherein at least part of said carrier has previously adhered to the surface thereof inorganic oxide fine particles. The developer composition does not cause background stains over long-term copying even in the relatively initial stage of running.Type: GrantFiled: September 13, 1991Date of Patent: January 9, 1996Assignee: Fuji Xerox Co., Ltd.Inventors: Chiaki Suzuki, Tetsu Torigoe, Yoshihiko Iida, Takaichi Kimura, Takayoshi Aoki
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Patent number: 5176978Abstract: A dry toner for developing electrostatic images is disclosed, which comprises a binder resin, a colorant and a wax consisting of a low molecular weight polypropylene and a high density polyethylene having a density of 0.96 or more, a molecular weight of 2,000 to 20,000 and an acid value of 1 or less, wherein the wax is dispersed in the binder resin to form domains having a size of 0.1 to 1.5 .mu.m. A process for producing the toner is also disclosed.Type: GrantFiled: October 17, 1991Date of Patent: January 5, 1993Assignee: Fuji Xerox Co., Ltd.Inventors: Kouichi Kumashiro, Tetsu Torigoe, Chiaki Suzuki, Takaichi Kimura, Takayoshi Aoki
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Patent number: 5085963Abstract: A dry developer for an electrophotographic process, said dry developer being composed of a toner and a dispersion type carrier composed of a resin and a magnetic powder, wherein polyethylene having a molecular weight of not larger than 10,000, a density of at least 0.95, and an average volume diameter of not larger than 15 .mu.m is externally added to the toner or directly mixed with the developer. The dry developer shows good fluidity and cleaning property, is excellent in environmental stability and durability, and can prevent the occurrence of the toner film phenomenon on a photoreceptor or carrier surfaces.Type: GrantFiled: September 19, 1990Date of Patent: February 4, 1992Assignee: Fuji Xerox Co., Ltd.Inventors: Chiaki Suzuki, Koichi Kumashiro, Tetsu Torigoe, Takaichi Kimura, Takayoshi Aoki