Patents by Inventor Okawara, Makoto

Okawara, Makoto 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 producing a vinyl resin using a silicon oil solvent
    Patent number: 5189102
    Abstract: A method for producing a vinyl resin comprising the steps of dissolving or dispersing a polymerizable vinyl monomer in a polymerization solvent containing a silicone oil, and polymerizing the polymerizable vinyl monomer in the presence of a polymerization catalyst.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: February 23, 1993
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuo Tsubuko, Shinichi Kuramoto, Kazuhiko Umemura, Hidemi Uematsu, Okawara, Makoto