Patents by Inventor Fujio Yagihasi

Fujio Yagihasi 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).

  • Bisphenol derivative and its manufacturing method
    Patent number: 6207841
    Abstract: A bisphenol derivative represented by the following formula and a manufacturing method thereof are disclosed. where R is a lower alkyl group, tetrahydropyranyl, methoxymethyl or trialkylsilyl group, and the benzene rings in the formula may be substituted by a lower alkyl group.
    Type: Grant
    Filed: August 22, 1994
    Date of Patent: March 27, 2001
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Fujio Yagihasi, Minoru Takamizawa
  • Bisphenol derivative and its manufacturing method
    Patent number: 5599949
    Abstract: A bisphenol derivative represented by the following formula and a manufacturing method thereof are disclosed: ##STR1## where R is a lower alkyl group, tetrahydropyranyl, methoxymethyl or trialkylsilyl group, and the benzene rings in the formula may be substituted by a lower alkyl group.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: February 4, 1997
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Fujio Yagihasi, Minoru Takamizawa
  • Positive resist composition comprising a bis (t-butoxycarbonylmethly(thymolphthalein as a dissolution inhibitor
    Patent number: 5512417
    Abstract: A positive resist composition comprising a poly(p-hydroxystyrene) as matrix resin which is synthesized by an anionic polymerization method and has a weight average molecular weight of from 8,000 to 20,000, bis(p-t-butoxycarbonylmethyl)thymolphthalein as dissolution inhibitor, bis(p-t-butylphenyl)iodonium triflate as acid generator; a compound which contains one amino group and one carboxyl group to function as acid deactivator and propylene glycol monomethyl ether acetate as organic solvent.
    Type: Grant
    Filed: February 14, 1995
    Date of Patent: April 30, 1996
    Assignees: Shin-Etsu Chemical Co., Ltd., Nippon Telegraph and Telephone Corp.
    Inventors: Hiroshi Ban, Akinobu Tanaka, Fujio Yagihasi, Jun Watanabe, Minoru Takamizawa