Patents by Inventor Takahiro Takasaki
Takahiro Takasaki 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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Publication number: 20250022682Abstract: A plasma generation unit includes: a first coil that includes first conductors that are connected in parallel to each other; and a first distribution portion that distributes, to each of the first conductors, first high frequency power to be supplied to the first coil. The first distribution portion includes: a first input portion to which the first high frequency power is input; a first branch portion at which the first high frequency power input to the first input portion is divided and delivered into first branch lines; and second branch portions at each of which a corresponding one of the first branch lines branches out into second branch lines. Each of the second branch lines is connected to one of first application portions that are included in the first conductors. The first branch lines have a substantially equal length. The second branch lines have a substantially equal length.Type: ApplicationFiled: July 9, 2024Publication date: January 16, 2025Inventors: Shogo OKITA, Takahiro MIYAI, Yoshiyuki WADA, Naoaki TAKEDA, Toshiyuki TAKASAKI, Hisao NAGAI, Seiya NAGANO
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Patent number: 6649315Abstract: A non-magnetic one-component developer comprising a substantially spherical polymerized toner which contains at least a binder resin and a colorant and has features that the volume average particle diameter is 5 to 10 &mgr;m, the proportion of particles having a particle diameter of at most 5 &mgr;m is at most 25% by number, the proportion of particles having a particle diameter of at least, 16 &mgr;m is at most 2% by volume, the standard deviation of the number particle diameter distribution is at most 1.8, and the spheroidicity represented by a ratio (dl/ds) of a length (dl) to a breadth (ds) in a particle is 1.0 to 1.3, and suitable for use in a cleaning system concurrent with development, and a developing method according to thee cleaning system concurrent with development making use of the non-magnetic one-component developer.Type: GrantFiled: February 23, 2001Date of Patent: November 18, 2003Assignee: Nippon Zeon Co., Ltd.Inventor: Takahiro Takasaki
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Patent number: 6544706Abstract: A polymerized toner of a core-shell structure, comprising colored polymer particles which contain a colorant, and a polymer layer which covers each of the colored polymer particles, wherein the polymerized toner has the following features: (a) the gel content being 60 to 95% as measured by an extraction method with tetrahydrofuran; (b) the melt index being 0.5 to 15 g/10 min as measured at 150° C. and under a load of 2.16 kg; and (c) the spheroidicity represented by an average value of a ratio (rl/rs) of a length (rl) to a breadth (rs) being 1.0 to 1.2, and a production process thereof.Type: GrantFiled: July 25, 2000Date of Patent: April 8, 2003Assignee: Nippon Zeon Co., Ltd.Inventor: Takahiro Takasaki
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Patent number: 6436598Abstract: A polymerized toner of a core-shell structure that colored polymer particles containing a colorant are covered with a polymer layer, wherein the polymerized toner has features that (1) the content of tetrahydrofuran-insoluble matter is 60 to 95 wt. %, and (2) the weight average molecular weight of tetrahydrofuran-soluble matter as determined by gel permeation chromatography is 50,000 to 400,000, and a production process thereof.Type: GrantFiled: November 9, 2000Date of Patent: August 20, 2002Assignee: Nippon Zeon Co., Ltd.Inventors: Akira Honma, Takahiro Takasaki
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Patent number: 6342328Abstract: A toner for development of electrostatic images, comprising at least a binder resin, a colorant and a charge control agent, wherein the charge control agent is a polar resin composed of a copolymer of a vinyl monomer and SO3X (X=H or alkali metal) group-containing (meth)acrylamide and having an SO3X group-containing (meth)acrylamide unit content of 0.1 to 10 wt. % and a weight average molecular weight of 17,000 to 25,000, and a production process of the toner.Type: GrantFiled: September 5, 2000Date of Patent: January 29, 2002Assignee: Nippon Zeon Co., Ltd.Inventors: Takahiro Takasaki, Kazu Niwa, Kojiro Masuo, Kazuhiro Sato
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Patent number: 6200718Abstract: A polymerized toner of core-shell structure, comprising core particles composed of colored polymer particles which contain a compound having at least one >C═N+< structure in its molecule and a colorant, and a layer of a polymer having a glass transition temperature higher than that of a polymer component making up the core particles, said polymer layer covering each of the core particles, a production process thereof, an image forming process comprising using the polymerized toner, and an image forming apparatus containing the polymerized toner.Type: GrantFiled: June 4, 1999Date of Patent: March 13, 2001Assignee: Nippon Zeon Co., Ltd.Inventors: Takahiro Takasaki, Noboru Yanagida
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Patent number: 6132919Abstract: A polymerized toner of core-shell structure, comprising core particles composed of colored polymer particles, which comprise a polyfunctional ester compound formed of a trifunctional or still higher polyfunctional polyhydric alcohol and a carboxylic acid, and a colorant, and shell which is formed of a polymer having a glass transition temperature higher than that of a polymer component making up the core particles and covers each of the core particles, a production process thereof, an image forming process comprising using the polymerized toner, and an image forming apparatus containing the polymerized toner.Type: GrantFiled: May 5, 1999Date of Patent: October 17, 2000Assignee: Nippon Zeon Co., Ltd.Inventors: Tokudai Ogawa, Noboru Yanagida, Takahiro Takasaki, Kazuhiro Sato
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Patent number: 6033822Abstract: Disclosed herein are a polymerized toner of core-shell structure, comprising core particles composed of colored polymer particles having a volume average particle diameter (dv) of 0.5-20 .mu.m and a ratio (dv/dp) of the volume average particle diameter (dv) to a number average particle diameter (dp) of at most 1.7, and shell which is formed of a polymer layer having an average film thickness of 0.001-0.1 .mu.m and covers each of the core particles, and a production process thereof.Type: GrantFiled: July 27, 1999Date of Patent: March 7, 2000Assignee: Nippon Zeon Co., Ltd.Inventors: Jun Hasegawa, Tokudai Ogawa, Jun Sakai, Takahiro Takasaki, Noboru Yanagida
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Patent number: 5958640Abstract: Disclosed herein are a polymerized toner of core-shell structure, comprising core particles composed of colored polymer particles having a volume average particle diameter (dv) of 0.5-20 .mu.m and a ratio (dv/dp) of the volume average particle diameter (dv) to a number average particle diameter (dp) of at most 1.7, and shell which is formed of a polymer layer having an average film thickness of 0.001-0.1 .mu.m and covers each of the core particles, and a production process thereof.Type: GrantFiled: October 14, 1997Date of Patent: September 28, 1999Assignee: Nippon Zeon Company, LtdInventors: Jun Hasegawa, Tokudai Ogawa, Jun Sakai, Takahiro Takasaki, Noboru Yanagida
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Patent number: 5607772Abstract: A binder for coating materials containing dispersed inorganic powder comprises a polyurethane resin containing (a) 2.2 to 7.0 terminal epoxy groups in one molecule in average and (b) 0.1 to 5.0% by weight as SO.sub.3 -- of a sulfonic acid salt group, 0.05 to 3.0% by weight as COO-- of a carboxylic acid salt group, or 0.02 to 1.0% by weight as N.sup.+ of a quaternary ammonium salt group in the molecule, and having a number-average molecular weight of 2,000 to 10,000. A coating material containing dispersed inorganic powder and a magnetic recording medium both use this binder. In a recording medium comprising a magnetic layer placed on a non-magnetic substrate, the magnetic layer comprises polyurethane resin (A) as a binder, vinyl chloride polymer (B) containing 0.Type: GrantFiled: March 10, 1995Date of Patent: March 4, 1997Assignee: Nippon Zeon Co., Ltd.Inventors: Masahiro Yamakawa, Kenji Akimoto, Katsuya Nakamura, Fumio Takano, Takahiro Takasaki