Patents by Inventor Yoneho Tabata

Yoneho Tabata 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).

  • Polytetrafluoroethylene resins that can be processed by shaping, shaped products thereof, and processes for producing the resins and shaped products
    Patent number: 9266984
    Abstract: A polytetrafluoroethylene resin comprising polytetrafluoroethylene having a two-dimensional branched structure in the molecule is produced by exposing polytetrafluoroethylene to an ionizing radiation at a dose of no more than 10 kGy.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: February 23, 2016
    Assignees: RAYTECH CORPORATION, DAIKIN INDUSTRIES, LTD.
    Inventors: Yoneho Tabata, Hideto Suzuki, Shigetoshi Ikeda, Minoru Iida, Minoru Kawai, Gen Kojima, Yasuhiko Sawada
  • POLYTETRAFLUOROETHYLENE RESINS THAT CAN BE PROCESSED BY SHAPING, SHAPED PRODUCTS THEREOF, AND PROCESSES FOR PRODUCING THE RESINS AND SHAPED PRODUCTS
    Publication number: 20110171403
    Abstract: A polytetrafluoroethylene resin comprising polytetrafluoroethylene having a two-dimensional branched structure in the molecule is produced by exposing polytetrafluoroethylene to an ionizing radiation at a dose of no more than 10 kGy.
    Type: Application
    Filed: September 30, 2009
    Publication date: July 14, 2011
    Inventors: Yoneho Tabata, Hideto Suzuki, Shigetoshi Ikeda, Minoru Iida, Minoru Kawai, Gen Kojima, Yasuhiko Sawada
  • Fluoroplastic composites and a process for producing the same
    Patent number: 6204301
    Abstract: Fibers as a reinforcing substrate are impregnated with the particles of polytetrafluoroethylene and pressed into a shape at the melting point of polytetrafluoroethylene. Alternatively, the reinforcing substrate sandwiched between polytetrafluoroethylene sheets is pressed into a shape at the melting point of polytetrafluoroethylene. In either case, the shaped article is then exposed to an ionizing radiation in an oxygen-free atmosphere at the melting point of polytetrafluoroethylene. The inherent characteristics of the polytetrafluoroethylene, i.e., heat resistance, chemical resistance, abrasion resistance and lubricity, are retained and yet radiation resistance and resin transparency are imparted.
    Type: Grant
    Filed: September 14, 1999
    Date of Patent: March 20, 2001
    Assignee: Japan Atomic Energy Research Institute
    Inventors: Akihiro Oshima, Akira Udagawa, Yosuke Morita, Tadao Seguchi, Yoneho Tabata
  • Product having reduced friction and improved abrasion resistance
    Patent number: 5985949
    Abstract: A product having reduced friction and improved abrasion resistance comprises a formed resin containing at least one fluorine-containing polymer which is exposed to an ionizing radiation. The formed resin may include from 1 to 100 weight percent of the fluorine-containing polymer in the form of powder, and from 99 to 0 percent of a high molecule polymer which is not exposed to the ionizing radiation. The fluorine-containing polymer is preferably exposed to the ionizing radiation for a total dose of from 1 KGy to 10 MGy in the absence of oxygen at a temperature not lower than the melting point of a starting fluorine-containing polymer.
    Type: Grant
    Filed: April 10, 1997
    Date of Patent: November 16, 1999
    Assignees: Japan Atomic Energy Research Institute, Hitachi Cable, Ltd., Raytech Corporation, Asahi Glass Co., Ltd.
    Inventors: Tadao Seguchi, Noboru Kasai, Akinari Nakayama, Hideki Yagyu, Yoneho Tabata, Kazushige Otsuhata, Shigetoshi Ikeda, Akihiro Ohshima, Mitsuharu Morozumi, Masumi Nomura
  • Modified polytetrafluoroethylene and process for its production by irradiation
    Patent number: 5444103
    Abstract: Modified PTFE is produced by exposing a starting PTFE to an ionizing radiation for a total dose of at least 100 kGy in the absence of oxygen at a temperature not lower than the crystal melting point of the starting PTFE. The thus modified PTFE is improved in radiation resistance and has rubber characteristics.
    Type: Grant
    Filed: October 4, 1993
    Date of Patent: August 22, 1995
    Assignee: Raytech Corporation
    Inventors: Yoneho Tabata, Kazushige Otsuhata, Tetsuya Ikeda, Kohji Ueno, Yuichi Yoshida, Akihiro Oshima, Tadao Suguchi, Hisaaki Kudoh
  • Process of hydrolyzing fluorine-containing multi-component copolymers
    Patent number: 4322511
    Abstract: A novel process for the production of fluorine-containing multi-component copolymers having functional groups is disclosed, which process is characterized in that tetrafluoroethylene having the formula: CF.sub.2 .dbd.CF.sub.2 ; one or two or more .alpha.,.beta.,.beta.-trifluoroacrylate having the generic formula: CF.sub.2 .dbd.CFCOOC.sub.n H.sub.2n+1 wherein n represents an integer of 1 or greater; and one or two or more .alpha.-olefin having the generic formula: ##STR1## wherein j and m each independently represents an integer of 0 to 11 inclusive; are copolymerized with one another in the presence of a radical initiator. The resultant interpolymer is hydrolyzed and cross-linked using ionizing radiation.
    Type: Grant
    Filed: June 12, 1980
    Date of Patent: March 30, 1982
    Assignee: Japan Atomic Energy Research Institute
    Inventors: Osamu Matsuda, Terutaka Watanabe, Yoneho Tabata, Sueo Machi
  • Process for production of fluorine-containing multi-component copolymers
    Patent number: 4294675
    Abstract: A novel process for the production of fluorine-containing multi-component copolymers having functional groups is disclosed, which process is characterized in that tetrafluoroethylene having the formula: CF.sub.2 .dbd.CF.sub.2 ; one or two or more .alpha.,.beta.,.beta.-trifluoroacrylate having the generic formula: CF.sub.2 .dbd.CFCOOC.sub.n H.sub.2n+1 wherein n represents an integer of 1 or greater; and one or two or more .alpha.-olefin having the generic formula: ##STR1## wherein j and m each independently represents an integer of 0 to 11 inclusive; are copolymerized with one another in the presence of a radical initiator.
    Type: Grant
    Filed: October 16, 1979
    Date of Patent: October 13, 1981
    Assignee: Japan Atomic Energy Research Institute
    Inventors: Osamu Matsuda, Terutaka Watanabe, Yoneho Tabata, Sueo Machi