Patents by Inventor Takehiro Sonoi

Takehiro Sonoi 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).

  • Composition for low hardness, fluorine-containing rubber
    Patent number: 5446081
    Abstract: A composition for low hardness, fluorine-containing rubber comprising solid fluorine-containing rubber, liquid fluorine-containing rubber, an aliphatic amine having an alkyl group having at least 8 carbon atoms and a perfluoropolyether has a good mold releasability at the vulcanization molding and can produce a vulcanized product having a JIS A hardness, according to JIS K-6301, of not more than 50 and less adhesiveness to a metal.
    Type: Grant
    Filed: September 2, 1993
    Date of Patent: August 29, 1995
    Assignee: Nippon Mektron, Limited
    Inventor: Takehiro Sonoi
  • Process for producing hexafluoroacetone or its hydrate
    Patent number: 4960947
    Abstract: Hexafluoroacetone or its hydrate is produced in a higher yield than that of the conventional process (1) by oxidizing a heptafluoroisobutenyl ether with ozone or (2) by thermally decomposing an octafluoroisobutyl ether or a heptafluoroisobutenyl ether in the presence of oxygen and an activated carbon catalyst.
    Type: Grant
    Filed: June 28, 1989
    Date of Patent: October 2, 1990
    Assignee: Nippon Mektron Limited
    Inventors: Takehiro Sonoi, Toshimasa Sagawa, Okimasa Yamada, Tetsuya Mizuno
  • Fluorine-containing elastomer composition
    Patent number: 4929686
    Abstract: A fluorine-containing elastomer composition comprising a fluorine-containing elastomer, at least one of oxide and hydroxide of divalent metal, a polyhydroxyaromatic compound, and a quaternary ammonium salt compound represented by the general formula: ##STR1## wherein R' is a piperidino or a pyrrolidinyl radical, and if desired, further containing 1,8-diazabicyclo-[5,4,0]-undec-7-ene or 1,5-diazabicyclo[4,3,0]-non-5-ene, has good storage stability as green elastomer composition and gives distinguished physical properties to the vulcanized products.
    Type: Grant
    Filed: February 23, 1989
    Date of Patent: May 29, 1990
    Assignee: Nippon Mektron Ltd.
    Inventors: Takehiro Sonoi, Okimasa Yamada
  • Process for producing hexafluoroacetone or its hydrate
    Patent number: 4885398
    Abstract: Hexafluoracetone or its hydrate is produced in a higher yield than that of the conventional process (1) by oxidizing a heptafluoroisobutenyl ether with ozone or (2) by thermally decomposing an octafluoroisobutyl ether or a heptafluoroisobutenyl ether in the presence of oxygen and an activated carbon catalyst.
    Type: Grant
    Filed: May 2, 1988
    Date of Patent: December 5, 1989
    Assignee: Nippon Mektron Limited
    Inventors: Takehiro Sonoi, Toshimasa Sagawa, Okimasa Yamada, Tetsuya Mizuno
  • Fluorine-containing elastomer composition
    Patent number: 4833212
    Abstract: A fluorine-containing elastomer composition which comprises (a) a fluorine-containing elastomer, (b) at least one of divalent metal oxide and hydroxide, (c) a polyhydroxyaromatic compound and (d) a complex compound of 1,8-diazobicyclo[5,4,0]undec-7-ene or diazabicyclo[4,3,0]non-5-ene and a divalent metal chloride, has a good stock storage stability and can produce a vulcanized product with improved vulcanized product properties and compression set.
    Type: Grant
    Filed: February 4, 1988
    Date of Patent: May 23, 1989
    Assignee: Nippon Mektron Limited
    Inventors: Okimasa Yamada, Tetsuya Mizuno, Takehiro Sonoi, Toshimasa Sagawa