Patents by Inventor Kohtaro Takahashi

Kohtaro Takahashi 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).

  • Blends of perfluoroelastomers and fluoroplastics
    Patent number: 7476711
    Abstract: Cured articles are prepared from a composition that comprises a blend of a perfluoroelastomer and 51-300 phr of a semi-crystalline thermoplastic copolymer comprising copolymerized units of tetrafluoroethylene and 5-12 weight percent of a perfluoro(alkyl vinyl ether). The semi-crystalline copolymer is present as particles having an average particle size greater than 100 nm.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: January 13, 2009
    Assignee: Du Pont Performance Elastomers. L.L.C.
    Inventors: Kohtaro Takahashi, Yuji Onodera
  • Blends of perfluoroelastomers and fluoroplastics
    Publication number: 20080097035
    Abstract: Cured articles are prepared from a composition that comprises a blend of a perfluoroelastomer and 51-300 phr of a semi-crystalline thermoplastic copolymer comprising copolymerized units of tetrafluoroethylene and 5-12 weight percent of a perfluoro(alkyl vinyl ether). The semi-crystalline copolymer is present as particles having an average particle size greater than 100 nm.
    Type: Application
    Filed: December 11, 2007
    Publication date: April 24, 2008
    Inventors: Kohtaro Takahashi, Yuji Onodera
  • Blends of perfluoroelastomers and fluoroplastics
    Patent number: 7354974
    Abstract: Cured articles are prepared from a composition that comprises a blend of a perfluoroelastomer and 51-300 phr of a semi-crystalline thermoplastic copolymer comprising copolymerized units of tetrafluoroethylene and 5-12 weight percent of a perfluoro(alkyl vinyl ether). The semi-crystalline copolymer is present as particles having an average particle size greater than 100 nm.
    Type: Grant
    Filed: April 26, 2005
    Date of Patent: April 8, 2008
    Assignee: DuPont Performance Elastomers LLC
    Inventors: Kohtaro Takahashi, Yuji Onodera
  • Bonding perfluoroelastomers to aluminum
    Publication number: 20060201613
    Abstract: A surface of an aluminum substrate is anodized. A curable perfluoroelastomer composition is then compression molded and vulcanized onto the anodized aluminum surface. The bonded part may then be post cured in order to improve both the tensile properties of the vulcanized perfluoroelastomer and the bond strength to the surface of the aluminum substrate.
    Type: Application
    Filed: February 10, 2006
    Publication date: September 14, 2006
    Inventors: Norihisa Minowa, Kohtaro Takahashi
  • Blends of perfluoroelastomers and fluoroplastics
    Publication number: 20050261431
    Abstract: Cured articles are prepared from a composition that comprises a blend of a perfluoroelastomer and 51-300 phr of a semi-crystalline thermoplastic copolymer comprising copolymerized units of tetrafluoroethylene and 5-12 weight percent of a perfluoro(alkyl vinyl ether). The semi-crystalline copolymer is present as particles having an average particle size greater than 100 nm.
    Type: Application
    Filed: April 26, 2005
    Publication date: November 24, 2005
    Inventors: Kohtaro Takahashi, Yuji Onodera
  • Valve seal assembly
    Patent number: 6932354
    Abstract: The present invention is directed to a valve seal assembly for use in multi-chamber vacuum devices. The seal assembly comprises a door and a deformable seal ring running along the periphery of the door, wherein the seal ring is held in place by a reversibly mounted securing means such as a disk, ring or clamp.
    Type: Grant
    Filed: February 6, 2003
    Date of Patent: August 23, 2005
    Assignee: DuPont Dow Elastomers, LLC
    Inventors: Dale Robert Kane, Norihisa Minowa, Kohtaro Takahashi
  • Valve seal assembly
    Publication number: 20050046123
    Abstract: The present invention is directed to a valve seal assembly for use in multi-chamber vacuum devices. The seal assembly comprises a door and a deformable seal ring running along the periphery of the door, wherein the seal ring is held in place by a reversibly mounted securing means such as a disk, ring or clamp.
    Type: Application
    Filed: October 7, 2004
    Publication date: March 3, 2005
    Inventors: Norihisa Minowa, Kohtaro Takahashi
  • Valve seal assembly
    Publication number: 20030164596
    Abstract: The present invention is directed to a valve seal assembly for use in multi-chamber vacuum devices. The seal assembly comprises a door and a deformable seal ring running along the periphery of the door, wherein the seal ring is held in place by a reversibly mounted securing means such as a disk, ring or clamp.
    Type: Application
    Filed: February 6, 2003
    Publication date: September 4, 2003
    Inventors: Dale Robert Kane, Norihisa Minowa, Kohtaro Takahashi
  • Curable perfluoroelastomer composition
    Patent number: 6281296
    Abstract: Perfluoroelastomer compositions comprising perfluoroelastomers having copolymerized units of tetrafluoroethylene, a perfluoro(vinyl ether), and a nitrile-containing cure site monomer are cured with compounds that are capable of generating ammonia at temperatures of 40° C.-330° C. to produce cured compositions having excellent thermal stability. The ammonia-generating compounds also act as cure accelerators in perfluoroelastomer compositions that incorporate other curing agents.
    Type: Grant
    Filed: August 4, 1999
    Date of Patent: August 28, 2001
    Assignee: DuPont Dow Elastomers L.L.C.
    Inventors: James Daniel MacLachlan, Peter Arnold Morken, Walter Werner Schmiegel, Kohtaro Takahashi
  • Thermally stable perfluoroelastomer composition
    Patent number: 6191208
    Abstract: Curable perfluoroelastomer compositions comprising A) a perfluoroelastomer having copolymerized units of tetrafluoroethylene, a perfluoro(vinyl ether), and a nitrile-containing cure site monomer, B) anhydrous silica, and C) a curing agent exhibit excellent thermal stability and reduced tendency to generate hydrogen fluoride under high temperature conditions.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: February 20, 2001
    Assignee: Dupont Dow Elastomers L.L.S.
    Inventor: Kohtaro Takahashi