Patents by Inventor Keisaburo Yamaguchi

Keisaburo Yamaguchi 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).

  • Process for the preparation of 2,2'-bis[4-(1,1,3,3-tetramethylbutyl)phenol]sulfide
    Patent number: 4248804
    Abstract: 2,2'-bis[4-(1,1,3,3-tetramethylbutyl)phenol]sulfide is prepared by suspending 4-(1,1,3,3-tetramethylbutyl)phenol in an organic solvent, reacting it with sulfur dichloride or sulfur monochloride at a temperature of from -10.degree. to 40.degree. C., and isolating the precipitate so formed.
    Type: Grant
    Filed: August 29, 1979
    Date of Patent: February 3, 1981
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Akihiro Yamaguchi, Tadashi Kobayashi, Keisaburo Yamaguchi, Hisamichi Murakami