Patents by Inventor Shin'ichi Negami

Shin'ichi Negami 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).

  • Lignosulfonic graft copolymer as a cement dispersant
    Patent number: 4977227
    Abstract: This invention provides a cement dispersant of a lignosulfonic acid graft copolymer, obtained by a redox free radical reaction of lignosulfonic acid or its salts with one or more acrylic or vinylic monomers containing functional groups, in an aqueous solution in the presence of a radical initiator, e.g, redox catalyst. The lignosulfonic acid graft copolymer has a molecular weight distribution of from 5.times.10.sup.2 to 5.times.10.sup.6.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: December 11, 1990
    Assignee: Sandoz Ltd.
    Inventors: Shin'ichi Negami, Hiroshi Nomachi, Toru Nemoto, Yoshio Tanaka, Akira Ohta