Patents by Inventor Setsuko Imaizumi

Setsuko Imaizumi 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).

  • Vulcanizable rubber composition improved in sulfur blooming with metal alkylxanthate
    Patent number: 4242472
    Abstract: The present invention relates to a vulcanizable rubber composition improved in a sulfur blooming obtained by coagulatingly keeping a supersaturated sulfur within said rubber composition. For preventing said sulfur blooming, in the present invention, a surface active agent such as sodium or potassium ethylxanthate, sodium or potassium isopropylxanthate, dialkyldithiophosphoric acid, diphenylthiourea, mercaptobenzothiazole, diphenylthiocarbazone, sodium oleate, sodium stearate or octadecylamineacetate is added to a rubber composition obtained by compounding sulfur as a vulcanizing agent in the amount of 0.5 to 10 parts by weight in relation to 100 parts by weight of rubber which may be any of natural rubber, synthetic rubber and the mixtures thereof.
    Type: Grant
    Filed: February 8, 1979
    Date of Patent: December 30, 1980
    Assignee: Bridgestone Tire Company Limited
    Inventors: Takashi Hoshino, Setsuko Imaizumi, Seisuke Tomita