Patents by Inventor Sadakazu Hokamura

Sadakazu Hokamura 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).

  • Patent number: 6034161
    Abstract: A cold-setting aqueous emulsion paint comprising a pigment and an aqueous emulsion resin consisting essentially of a copolymer of (a) a polymerizable monomer of the formula (I): ##STR1## wherein R is a hydrogen atom or a methyl group, and n is 1 or 2, (b) a polymerizable monomer having a carboxyl group and an ethylenic double bond, and (c) a polymerizable monomer having an ethylenic double bond copolymerizable with the above polymerizable monomers (a) and (b).
    Type: Grant
    Filed: June 2, 1998
    Date of Patent: March 7, 2000
    Assignee: Dai Nippon Toryo Co., Ltd.
    Inventors: Tetsuo Nakamura, Hiroharu Sasaki, Kazuyoshi Tsuneta, Sadakazu Hokamura
  • Patent number: 5741599
    Abstract: Aromatic diamines having a carboxylic acid group and various other diamines are reacted with aromatic tetracarboxylic dianhdyrides in organic polar solvents to provide polyimides. Polyimide compositions for electrodeposition which comprise the neutralized salts of the polyimides, water and poor solvents for the polyimides have good keeping quality and when electrodeposited on electrically conductive materials, can form polyimide coats that have high levels of appearance, smoothness and denseness while exhibiting good physical and chemical characteristics in such aspects as heat resistance, electrical insulation and chemical resistance.
    Type: Grant
    Filed: October 10, 1996
    Date of Patent: April 21, 1998
    Assignee: PI Materials Research Laboratory
    Inventors: Yoshihiro Oie, Hiroshi Itatani, Shinichi Furusaki, Yuji Yamazaki, Sadakazu Hokamura
  • Patent number: 4514445
    Abstract: A process for forming a corrosion resistant coating, which comprises (i) a step of priming a solvent-type coating composition on a substrate and drying it to form a prime coat, and (ii) a step of coating a radical-polymerizable and oxidation-polymerizable, room temperature curing type solventless coating composition on the prime coat and polymerizing it to form a cured coating.
    Type: Grant
    Filed: November 8, 1983
    Date of Patent: April 30, 1985
    Assignees: Dai Nippon Toryo Co., Ltd., Mitsubishi Yuka Fine Chemicals Co., Ltd.
    Inventors: Sadakazu Hokamura, Seiji Yamada, Mitsutoshi Aritomi, Yuji Yoshida
  • Patent number: 4508767
    Abstract: A process for forming a moisture resistant coating, which comprises:(i) a step of priming a coating composition on a substrate and drying it to form a prime coat,(ii) a step of coating thereon a radical-polymerizable and oxidation-polymerizable, room temperature solventless coating composition containing a scaly pigment and polymerizing it to form a cured intermediate coat, and(iii) a step of finish coating thereon an air-drying finish coating composition and drying it to form an finish coat.
    Type: Grant
    Filed: November 30, 1983
    Date of Patent: April 2, 1985
    Assignees: Dai Nippon Tokyo Co., Ltd, Mitsubishi Yuka Fine Chemicals Co., Ltd.
    Inventors: Sadakazu Hokamura, Toshio Shinohara, Mitsutoshi Aritomi, Yuji Yoshida
  • Patent number: 4505954
    Abstract: A process for forming a corrosion resistant high-build type coating, which comprises (i) a step of priming on a substrate a coating composition comprising (a) 100 parts by weight of a mixture composed of from 99.9 to 60% by weight of a vegetable oil and/or a phthalic alkyd resin, and from 0.1 to 40% by weight of tricyclodecene and/or its derivative, and (b) from 1 to 500 parts by weight of at least one member selected from the group consisting of an oxyacid salt, and metal lead and its oxide and salt, followed by drying it to form a prime coat, and (ii) a step of applying thereon a radical-polymerizable and oxidation-polymerizable, room temperature curing type solventless coating composition, and polymerizing it to form a cured coating film.
    Type: Grant
    Filed: December 8, 1983
    Date of Patent: March 19, 1985
    Assignees: Dai Nippon Toryo Co., Ltd., Mitsubishi Yuka Fine Chemicals Co., Ltd.
    Inventors: Sadakazu Hokamura, Toshio Shinohara, Ryoichi Nomura, Mitsutoshi Aritomi, Yuji Yoshida