Patents by Inventor Masanari Umeda
Masanari Umeda 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: 10095156Abstract: Provided is a conductive foam roll having a high surface opening ratio that achieves both cleaning performance and low resistance. A conductive foam roll 10 includes a shaft body 12 and a conductive foam layer 14 around the shaft body 12, wherein the conductive foam layer 14 has a surface opening ratio of 50% to 90%, and wherein the conductive foam layer 14 contains an ionic conductive agent that contains salt of diallyl-type ammonium cations, and at least one selected from the group consisting of N,N-bis(trifluoromethanesulfonyl)imide anions, and N,N-bis(fluorosulfonyl)imide anions.Type: GrantFiled: August 18, 2016Date of Patent: October 9, 2018Assignee: SUMITOMO RIKO COMPANY LIMITEDInventors: Kunio Ito, Satoshi Suzuki, Masanari Umeda, Motoharu Ishihara
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Publication number: 20170075253Abstract: Provided is a conductive foam roll having a high surface opening ratio that achieves both cleaning performance and low resistance. A conductive foam roll 10 includes a shaft body 12 and a conductive foam layer 14 around the shaft body 12, wherein the conductive foam layer 14 has a surface opening ratio of 50% to 90%, and wherein the conductive foam layer 14 contains an ionic conductive agent that contains salt of diallyl-type ammonium cations, and at least one selected from the group consisting of N,N-bis(trifluoromethanesulfonyl)imide anions, and N,N-bis(fluorosulfonyl)imide anions.Type: ApplicationFiled: August 18, 2016Publication date: March 16, 2017Applicant: SUMITOMO RIKO COMPANY LIMITEDInventors: Kunio Ito, Satoshi Suzuki, Masanari Umeda, Motoharu Ishihara
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Patent number: 8718518Abstract: A development roll for electrophotographic equipment includes a shaft body, a rubber elastic layer formed by molding on an outer circumference of the shaft body and having many convex portions formed by transfer molding on the outer circumferential surface thereof, and a coating layer disposed on an outer circumference of the rubber elastic layer. The coating layer is composed of a cured body of a coating material containing (A) a thermoplastic urethane having a number-average molecular weight in the range of 50,000 to 200,000, (B) a polyol having a number-average molecular weight in the range of 500 to 4,000, and (C) a curing agent. The mass percentages a, b, and c of the components (A), (B), and (C) satisfy the following expressions: a+b+c=100, 40?a?75, 5?b?20, and 20?c.Type: GrantFiled: August 6, 2012Date of Patent: May 6, 2014Assignee: Tokai Rubber Industries, Ltd.Inventors: Shuichi Egawa, Masanari Umeda, Yousuke Hayashi
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Publication number: 20120294656Abstract: A development roll for electrophotographic equipment includes a shaft body, a rubber elastic layer formed by molding on an outer circumference of the shaft body and having many convex portions formed by transfer molding on the outer circumferential surface thereof, and a coating layer disposed on an outer circumference of the rubber elastic layer. The coating layer is composed of a cured body of a coating material containing (A) a thermoplastic urethane having a number-average molecular weight in the range of 50,000 to 200,000, (B) a polyol having a number-average molecular weight in the range of 500 to 4,000, and (C) a curing agent. The mass percentages a, b, and c of the components (A), (B), and (C) satisfy the following expressions: a+b+c=100, 40?a?75, 5?b?20, and 20?c.Type: ApplicationFiled: August 6, 2012Publication date: November 22, 2012Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Shuichi EGAWA, Masanari UMEDA, Yousuke HAYASHI
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Patent number: 6918866Abstract: An electrically conductive roll includes a shaft body and at least a conductive elastic layer formed by extrusion on an outer circumferential surface of the shaft body. The conductive elastic layer is formed from at least one conductive rubber composition which includes a rubber material, a thermoplastic resin having crosslinkable double bonds and a melting point in a range from 40° C. to 100° C., and at least one conductive agent. The thermoplastic resin is included in an amount of 5 to 50 wt. % of a total amount of the rubber material and the thermoplastic resin.Type: GrantFiled: August 4, 2003Date of Patent: July 19, 2005Assignee: Tokai Rubber Industries, Ltd.Inventors: Shiro Miyamori, Yasuyuki Hayasaki, Masanari Umeda, Kenichi Tsuchiya
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Publication number: 20050138810Abstract: A method of producing an electrically conductive roll having a proper crown shape at lower costs through a smaller number of process steps and without polishing. In this production method, a crown-shaped rubber layer is formed unitarily on a metal core by variably controlling the amount of a rubber material adhering on the metal core along the length of the metal core during extrusion of the rubber material.Type: ApplicationFiled: February 16, 2005Publication date: June 30, 2005Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Shiro Miyamori, Yasuyuki Hayasaki, Masanari Umeda
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Publication number: 20040082451Abstract: A method of producing an electrically conductive roll having a proper crown shape at lower costs through a smaller number of process steps and without polishing. In this production method, a crown-shaped rubber layer is formed unitarily on a metal core by variably controlling the amount of a rubber material adhering on the metal core along the length of the metal core during extrusion of the rubber material.Type: ApplicationFiled: October 23, 2003Publication date: April 29, 2004Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Shiro Miyamori, Yasuyuki Hayasaki, Masanari Umeda
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Publication number: 20040062940Abstract: An electrically conductive roll which includes a shaft body and which includes at least a conductive elastic layer formed by extrusion on an outer circumferential surface of the shaft body, wherein the conductive elastic layer is formed of at least one conductive rubber composition which includes a rubber material, a thermoplastic resin having crosslinkable double bonds and a melting point in a range from 40° C. to 100° C., and at least one conductive agent, the thermoplastic resin being included in an amount of 5 to 50 wt. % of a total amount of the rubber material and the thermoplastic resin.Type: ApplicationFiled: August 4, 2003Publication date: April 1, 2004Applicant: Tokai Rubber Industries, Ltd.Inventors: Shiro Miyamori, Yasuyuki Hayasaki, Masanari Umeda, Kenichi Tsuchiya
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Patent number: 5278217Abstract: A water absorptive composition comprising a thermoplastic elastomer as a first component, a water-absorptive resin as a second component, and a third component selected from the group which consists of: a water-soluble resin; a hydrophilic compound selected from the group consisting of metal salt of carboxylic acid, polyhydric alcohol, amino alcohol, linear polyether, saccharide, and sugar alcohol; and a surface treating agent selected from the group consisting of sorbitan fatty acid ester, glycidyl ether of polyhydric alcohol, and silane coupling agent. The composition is suitably used for producing a water absorptive member for protecting optical fiber elements of an optical fiber cable.Type: GrantFiled: October 7, 1992Date of Patent: January 11, 1994Assignees: Tokai Rubber Industries, Ltd., Summitomo Electric Industries, Ltd., Nippon Telegraph and Telephone Corp.Inventors: Masanari Umeda, Yukio Sakuraba, Fumihiro Ashiya, Toshinobu Matsuo
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Patent number: 5244934Abstract: A process of producing a water absorptive resin, wherein a water absorptive polymer which comprises cross-linked poly(metal salt of acrylic acid) as a major component is impregnated with water, and the water-impregnated water absorptive polymer is exposed to one of a high-temperature highly-humid atmosphere or a ultraviolet radiation, to thereby partially release the cross-linkage of the cross-linked poly(metal salt of acrylic acid).Type: GrantFiled: December 2, 1991Date of Patent: September 14, 1993Assignees: Takai Rubber Industries, Ltd., Sumitomo Electric Industries, Ltd.Inventors: Masanari Umeda, Yukio Sakuraba, Hiroshi Baba
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Patent number: 5204175Abstract: A water absorptive fabric including a layer of a water absorptive polymer whose major components consist of a cross-linked poly(metal salt of acrylic acid) and a water-soluble resin. The fabric may be produced by first impregnating a fabric substrate with a solution which contains a metal salt of acrylic acid in the form of a monomer, a cross-linking agent and a water-soluble resin, and then heating the impregnated fabric substrate to thereby copolymerize the monomer and the cross-linking agent, in the presence of the water-soluble resin.Type: GrantFiled: June 7, 1991Date of Patent: April 20, 1993Assignees: Tokai Rubber Industries, Ltd., Sumitomo Electric Industries, Ltd.Inventors: Masanari Umeda, Yukio Sakuraba, Hiroshi Baba
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Patent number: 5179611Abstract: A water absorptive composition comprising a thermoplastic elastomer as a first component, a second component and a third component selected from the group which consists of: a water-soluble resin; a hydrophilic compound selected from the group consisting of metal salt of carboxylic acid, polyhydric alcohol, amino alcohol, linear polyether, saccharide, and sugar alcohol; and a surface treating agent selected from the group consisting of sorbitan fatty acid ester, glycidyl ether of polyhydric alcohol, and silane coupling agent. The composition is suitably used for producing a water absorptive member for protecting optical fiber elements of an optical fiber cable.Type: GrantFiled: July 15, 1991Date of Patent: January 12, 1993Assignees: Tokai Rubber Industries, Ltd., Sumitomo Electric Industries, Ltd., Nippon Telgraph and Telephone Corporation, Telephone CorporationInventors: Masanari Umeda, Yukio Sakuraba, Fumihiro Ashiya, Toshinobu Matsuo