Patents by Inventor Yasuji Kawamura

Yasuji Kawamura 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).

  • Powdered leather and method of producing the same
    Patent number: 5534327
    Abstract: A powdered leather which is composed of at least 85% by weight of cortex, at most 2% by weight of oil and fat, and at most 0.5% by weight of Na.sup.+ and Ca.sup.2+ ions capable of being eluted by water and which has an average particle size (D.sub.50) of at most 7 .mu.m, a standard deviation of the average particle size being at most 3 .mu.m. With this powdered leather, it is possible to thin films, coatings, fibers, etc. which would hardly be deteriorated with time.
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: July 9, 1996
    Assignee: Idemitsu Petrochemical Co., Ltd.
    Inventors: Tohru Nishi, Yasuji Kawamura, Kazuo Minato, Nobuo Kusamoto, Haruki Kai, Kazuhisa Kaneda, Takao Inokuchi
  • Highly moisture-absorptive fiber
    Patent number: 5134031
    Abstract: A highly moisture-absorptive fiber obtained by mixing and kneading one or more kinds of animal protein fibers, general protein forming the animal skin, bones, and others, pulverized to very fine powder of the 0.05 to 15 .mu.m size with a polymer of synthetic fiber, semi-synthetic fiber or regenerated fiber or polymer of chemical fiber material consisting of a mixture of more than two kinds of these polymers and spinning the kneaded composition, which can give a fine fiber having flexibility and proper elongation.
    Type: Grant
    Filed: July 13, 1990
    Date of Patent: July 28, 1992
    Assignees: Descente Ltd., Idemitsu Petrochemical Co.
    Inventors: Shunsaku Kagechi, Nobuo Kusamoto, Yasuji Kawamura