Patents by Inventor Masakazu Sagoh

Masakazu Sagoh 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 production of phenolic resin modified with liquid polybutadiene
    Patent number: 4336347
    Abstract: A process for the production of a phenolic resin modified with a liquid polybutadiene being useful as an impregnating varnish in the production of a copper-clad laminate for a printed circuit, which comprises preparing an adduct of a liquid polybutadiene having a number average molecular weight of 150 to 5,000 with an .alpha., .beta.-unsaturated dicarboxylic acid or its anhydride, subjecting the adduct to an addition reaction with one or plurality of phenols in the presence of an acid catalyst to obtain a composition and reacting the composition with formaldehyde in the presence of a basic catalyst.
    Type: Grant
    Filed: October 1, 1980
    Date of Patent: June 22, 1982
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Masakazu Sagoh, Takanobu Noguchi, Seimei Yasui