Patents by Inventor Yoji Hirasawa

Yoji Hirasawa 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).

  • Catalyst composition for producing polyether polyamine and production method of polyether polyamine by use of the catalysts composition
    Patent number: 5696293
    Abstract: The present invention provides a catalyst composition for producing a polyether polyamine, comprising:(a) ruthenium and(b) at least one of metals selected from the group consisting of palladium, platinum, rhodium, osmium, iridium, rhenium, technetium, molybdenum and tungsten on a carrier.
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: December 9, 1997
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Christopher Harold Phillips, Yoji Hirasawa, Keiichi Okajima, Julius John Batty, Brian Lewis Booth
  • Paint resin
    Patent number: 4976785
    Abstract: Disclosed is a paint resin prepared by reacting an aluminum chelate compound with a resin having an active hydrogen bonded to an electrophilic atom or atomic group, and/or epoxy group.
    Type: Grant
    Filed: February 14, 1989
    Date of Patent: December 11, 1990
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Shinji Nakano, Koichi Tsutsui, Shoji Ikeda, Yoji Hirasawa
  • Production of polymeric polyols
    Patent number: 4767846
    Abstract: Polymeric polyols are prepared by reacting a polyhydroxy initiator compound with an epoxide in the presence of alkali metal hydroxide catalyst used in an amount of at least 10% by mole based on the molar amount of polyhydroxy initiator compounds. The polyols so obtained may be chain extended by reaction with further epoxide in the presence of at least 10% by mole of an alkali metal hydroxide catalyst based on the molar amount of the polymeric polyol.
    Type: Grant
    Filed: December 2, 1985
    Date of Patent: August 30, 1988
    Assignees: Nippon Paint Company Limited, The University of Manchester Institute of Science and Technology
    Inventors: Robert F. T. Stepto, Richard H. Still, Yoji Hirasawa
  • Pigment dispersing resin and composition containing same
    Patent number: 4556683
    Abstract: A pigment dispersing resin which essentially consists of a modified polymer obtained by introducing at least one of acidic groups and basic groups into a polymeric polyol of star-shaped structure prepared by reacting a polyol having at least four hydroxyl groups per molecule with an epoxide, the resin being compatible with pigments and vehicle resins, and a pigment dispersed paste which comprises the pigment dispersing resin and a pigment, the pigment dispersed paste being low in viscosity over a long period of time.
    Type: Grant
    Filed: August 18, 1983
    Date of Patent: December 3, 1985
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Yoji Hirasawa, Shoji Ikeda