Patents by Inventor Yoshifumi Ohama

Yoshifumi Ohama 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).

  • Process for preparing a dispersing component comprising an inorganic oxide sol
    Patent number: 6376559
    Abstract: A process for preparing a dispersing component of an inorganic oxide sol which involves dehydrating an aqueous inorganic oxide sol by adding an azeotropic solvent to the aqueous inorganic sol to form an azeotropic mixture, carrying out azeotropic distillation and then surface-treating the dispersing component of the inorganic oxide sol with a silane coupling agent.
    Type: Grant
    Filed: July 27, 1999
    Date of Patent: April 23, 2002
    Assignee: BASF NOF Coatings Co., Ltd.
    Inventors: Keiji Komoto, Keishi Yoshikai, Masahiko Hirono, Yoshifumi Ohama
  • Coating composition, process for preparing coating composition and process for preparing dispersing component of inorganic oxide sol
    Patent number: 6022919
    Abstract: A coating composition which comprises (A) a resin having a glass transition temperature of 50 to 120.degree. C., a number average molecular weight of 2,000 to 100,000, a hydroxyl value of 50 to 150 mgKOH/g and an acid value of 1 to 25 mgKOH/g, which is produced by copolymerizing 10 to 90 percent by weight of (a) a (meth)acrylic acid ester of a C.sub.1 to C.sub.12 alkyl alcohol, 10 to 50 weight % of (b) a first polymerizable double bond-containing and hydroxyl group-containing monomer, 0.
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: February 8, 2000
    Assignee: NOF Corporation
    Inventors: Keiji Komoto, Keishi Yoshikai, Masahiko Hirono, Yoshifumi Ohama
  • Ultraviolet-curable coating composition
    Patent number: 5438080
    Abstract: A ultraviolet-curable coating composition is disclosed, which comprises a specific ultraviolet-curable polyfunctional (meth)acrylate, a specific urethane-curing polymer, and a specific polyisocyanate compound in a specific compounding ratio and having incorporated therein a photo stabilizer and a photopolymerization initiator. The composition provides a coating film of large thickness in one operation and is sufficiently cured even with non-uniform ultraviolet radiation and the coating film obtained from such a composition fully satisfies various requirements, such as appearance, adhesion, and weathering resistance.
    Type: Grant
    Filed: September 18, 1992
    Date of Patent: August 1, 1995
    Assignee: Nippon Oil and Fats Co., Ltd.
    Inventors: Yoshifumi Ohama, Yoshihide Chihara, Yasufumi Honda, Yasuhiro Miyamoto
  • Process for painting a polyolefinic resin component
    Patent number: 5288520
    Abstract: The present invention provides a process for painting a polyolefinic resin component comprising washing the surface of the polyolefinic resin component, directly coating at least one time the surface with the following paint, and forming topcoat on the surface, the paint being a mixture of a main component containing principally a polymer resin having a hydroxyl number of 20-150, which is obtained by polymerizing (A) Chlorinated polyolefin, (B) Acrylic monomer and (C) Polyester prepolymer and a curing agent of (D) polyfunctional isocyanate compound.
    Type: Grant
    Filed: September 25, 1991
    Date of Patent: February 22, 1994
    Assignee: Suzuki Motor Corporation
    Inventors: Kazuaki Toyoshima, Takumi Kunikiyo, Mitsutoshi Shimizu, Shousaku Yamamoto, Yoshifumi Ohama, Yasuyuki Takeuchi