Patents by Inventor Kohichi Morotomi

Kohichi Morotomi 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 polycarbonate oligomer
    Patent number: 4089888
    Abstract: Polycarbonate oligomer having uniform qualities is prepared by reacting an aqueous alkaline solution of 2,2-(4,4'-dihydroxydiphenyl) propane with phosgene in the presence of methylene chloride and as a characteristic point of this method, in the presence of an inert gas in an amount of 1 to 10 mol % based upon the phosgene.
    Type: Grant
    Filed: July 12, 1976
    Date of Patent: May 16, 1978
    Assignee: Idemitsu Petrochemical Co. Ltd.
    Inventors: Ichiro Tokumitsu, Hideo Konuma, Shigeaki Mochizuki, Kohichi Morotomi, Norio Murai, Mikio Koyama