Patents by Inventor Shun-ichi Kiriyama

Shun-ichi Kiriyama 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).

  • Method for manufacturing heat-stable polyesters using phosphonic acid compounds with cyclic carbonates and catalyst
    Patent number: 4374961
    Abstract: This invention is a method of manufacturing heat-stable polyesters, characterized in that phosphonic acid compounds are added, when heat-stable polyesters with decreased terminal carboxyl groups are manufactured by reacting polyesters and cyclic carbonate compounds in the presence of an alkali halide compound catalyst.
    Type: Grant
    Filed: May 29, 1981
    Date of Patent: February 22, 1983
    Assignee: Unitika Limited
    Inventors: Kazushige Kudo, Yoshihiro Arai, Ryoichi Tsurutani, Shun-ichi Kiriyama