Patents by Inventor Yoshiko Fujiyama

Yoshiko Fujiyama 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).

  • Patent number: 4478956
    Abstract: Bisphenols are prepared by condensation of a phenol with a ketone in the presence of a sulfonic acid type cation exchange resin partially modified with a pyridinealkanethiol of the formula:Py--(CH.sub.2).sub.n SHwherein n is a positive integer and Py is 3-pyridyl when n is 1, or 2-, 3- or 4-pyridyl when n is more than 1.
    Type: Grant
    Filed: August 4, 1983
    Date of Patent: October 23, 1984
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Takao Maki, Tetsuo Masuyama, Toshiharu Yokoyama, Yoshiko Fujiyama
  • Patent number: 4423252
    Abstract: Bisphenols are prepared by condensation of a phenol with a ketone in the presence of a sulfonic acid type cation exchange resin partially modified with a pyridinealkanethiol of the formula:Py--(CH.sub.2).sub.n SHwherein n is a positive integer and Py is 3-pyridyl when n is 1, or 2-, 3- or 4-pyridyl when n is more than 1.
    Type: Grant
    Filed: July 2, 1981
    Date of Patent: December 27, 1983
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Takao Maki, Tetsuo Masuyama, Toshiharu Yokoyama, Yoshiko Fujiyama