Patents by Inventor Keiji Kofuji

Keiji Kofuji 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).

  • Polymers having hydroxyl and carboxyl groups, and production process thereof
    Patent number: 5523380
    Abstract: A polymer comprising an .alpha.-glycol structure unit ##STR1## and a carboxylic acid-based structure unit ##STR2## provides superior results with respect to dispersibility, a chelating ability and a viscosity-stabilizing effect and is useful as a detergent builder, pigment- and cement-dispersing agents, a hydrogen peroxide stabilizer and a gas barrier agent. This polymer can further comprise the following lactone structure unit. ##STR3## This polymer can be produced by copolymerizing a conjugated diene monomer and a carboxylic acid-based monomer and oxidizing a copolymer obtained.
    Type: Grant
    Filed: July 13, 1994
    Date of Patent: June 4, 1996
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Hideyuki Tahara, Hiroshi Itoh, Keiji Kofuji, Masahito Takagi