Patents by Inventor Tetsuo Tsuboi

Tetsuo Tsuboi 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).

  • Bis(2,6-dis-tert-butyl-4-branched propyl or butyl phenyl)-pentaerythritol spiro phosphites and synthetic resin compositions containing such phosphites
    Patent number: 4888371
    Abstract: Bis(2,6-di tert butyl-4-branched propyl or butyl phenyl)-pentaerythritol spiro phosphites are provided having the formula: ##STR1## wherein R is a branched propyl or butyl group, such as isopropyl, iso-butyl, or sec-butyl, as well as synthetic resin compositions having enhanced resistance to deterioration upon exposure to the heat and light comprising such as bis(2,6-di-t-butyl-4-branched propyl or butyl phenyl)pentaerythritol spiro phosphites.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: December 19, 1989
    Assignee: Adeka Argus Chemical Co., Ltd.
    Inventors: Kenji Tajima, Tetsuo Tsuboi, Ryozo Arata