Patents by Inventor Nobuhiko Takeda

Nobuhiko Takeda 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).

  • Water repellent gypsum composition
    Patent number: 4042409
    Abstract: A water repellent gypsum composition comprising a gypsum, and a paraffin emulsion prepared by emulsifying (a) paraffin hydrocarbon having a melting point of 40.degree.-80.degree. C and (b) an oxidized paraffin having an acid value of 10-70 at a ratio of from 97:3 to 50:50 by weight, respectively, in the presence of a water soluble alkali compound. Optionally, a polymer emulsion or solution may be added.
    Type: Grant
    Filed: April 1, 1976
    Date of Patent: August 16, 1977
    Assignees: Mitsubishi Chemical Industries Limited, Yoshino Gypsum Co., Ltd.
    Inventors: Ichiro Terada, Tadashi Yamada, Michio Nishi, Mitsuo Uchida, Naomasa Sugiyama, Mamoru Kaneko, Nobuhiko Takeda