Patents by Inventor Takatoshi Tsumiyama

Takatoshi Tsumiyama 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 purifying phosphonitrile chlorides
    Patent number: 4522689
    Abstract: A process for completely separating tri(phosphonitrile chloride) from tetra(phosphonitrile chloride) and/or phosphonitrile chloride oligomer which includes vacuum distillation of the phosphonitrile chloride mixture together with an inert mixture of hydrocarbons as solvent.
    Type: Grant
    Filed: October 9, 1984
    Date of Patent: June 11, 1985
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Hiroshi Tanino, Tetsuhiko Okamoto, Shinichiro Ueyama, Kazuhiko Fujikawa, Takatoshi Tsumiyama