Patents by Inventor Hirotoshi Doki

Hirotoshi Doki 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).

  • Automobile body external panel-used water based coating composition and multi-layer coating film-forming method
    Publication number: 20050014885
    Abstract: An automobile body external panel-used water based coating composition containing, as essential components, (A) a resin particle containing an olefin polymer and an acrylic polymer in the same particle, (B) a hydroxyl group-containing resin, (C) a curing agent, and (D) a pigment, and a multi-layer coating film-forming method by use of the water based coating composition.
    Type: Application
    Filed: June 9, 2004
    Publication date: January 20, 2005
    Inventors: Hideaki Katsuta, Shingo Sato, Hideo Sugai, Makoto Nakano, Kojiro Kan, Hirotoshi Doki
  • Polymer and applications thereof
    Patent number: 6255400
    Abstract: A polymer (B) is prepared by polymerizing one or more vinyl monomers (c) in the presence of a polymer (A) prepared by polymerizing one or more vinyl monomers (a) selected from the group consisting of vinyl monomers represented by the general formula (1): wherein R1 represents a hydrogen atom or a lower alkyl with 1 to 3 carbon atoms and n is an integer of 1 to 8 and their salts with one or more vinyl monomers (b) which are co-polymerizable with the vinyl monomer components (a).
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: July 3, 2001
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Hiroshi Itoh, Susumu Oyama, Takashi Yodoya, Kenji Tsuboi, Tsugio Matsubara, Kenichi Nakamura, Hirotoshi Doki, Shinya Yamagami, Toshiki Oyanagi, Kenzo Seita
  • Acrylamide polymers and use thereof
    Patent number: 5942573
    Abstract: Provided by this invention are an acrylamide polymer which has a weight-average molecular weight (a) of from 1,500,000 to 10,000,000 and a weight-average inertial radius (b) of from 30 to 150 nm, the ratio (b)/(a) of the weight-average inertial radius (b) to the weight-average molecular weight (a) being 0.00004 or smaller; and an aqueous solution of an acrylamide polymer which solution has a polymer concentration ranging from 22 to 60%, a Brookfield viscosity at 25.degree. C. of 50,000 cps or smaller and a weight-average molecular weight of from 500,000 to 10,000,000. They are useful as paper strength agents.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: August 24, 1999
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Hirotoshi Doki, Hitoshi Ishigaki, Toshiki Oyanagi, Tsugio Matsubara, Shigeo Watanabe
  • Acrylamide polymers and use thereof
    Patent number: 5627249
    Abstract: Provided by this invention are an acrylamide polymer which has a weight-average molecular weight (a) of from 1,500,000 to 10,000,000 and a weight-average inertial radius (b) of from 30 to 150 nm, the ratio (b)/(a) of the weight-average inertial radius (b) to the weight-average molecular weight (a) being 0.00004 or smaller; and an aqueous solution of an acrylamide polymer which solution has a polymer concentration ranging from 22 to 60%, a Brookfield viscosity at 25.degree. C. of 50,000 cps or smaller and a weight-average molecular weight of from 500,000 to 10,000,000. They are useful as paper strength agents.
    Type: Grant
    Filed: December 23, 1994
    Date of Patent: May 6, 1997
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Hirotoshi Doki, Hitoshi Ishigaki, Toshiki Oyanagi, Tsugio Matsubara, Shigeo Watanabe