Patents by Inventor Yoshitaka Umemoto

Yoshitaka Umemoto 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).

  • Low fuming phenolic resin prepreg and process for producing the same
    Patent number: 5284702
    Abstract: A low fuming phenolic resin prepreg comprising a fibrous base impregnated with 20 to 60% by weight of a resin composition comprising (a) 100 parts by weight of a resol phenolic resin, (b) from 1.5 to 15 parts by weight of polyacrylamide, (c) from 1.5 to 25 parts by weight of an epoxy resin, and (d) from 1.5 to 15 parts by weight of an inorganic filler, and the method for preparing the prepreg by impregnating a solution of (a), (b) and (c) having dispersed therein the filler into a fibrous base. The method for the prepreg comprising impregnating the fibrous base with the resin composition. The phenolic resin prepreg has low fuming properties as well as excellent self-adhesion.
    Type: Grant
    Filed: August 15, 1991
    Date of Patent: February 8, 1994
    Assignee: Toho Rayon Co., Ltd.
    Inventors: Yoshitaka Umemoto, Takayuki Tanaka, Yasuo Furukawa