Patents by Inventor Takumi Honda

Takumi Honda 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: 5510410
    Abstract: The invention is an aqueous autodeposition coating composition that produces a film that has a better adherence and corrosion resistance than the films formed by the prior-art coating compositions, but which does so without a rinse treatment (for example, a chromium containing solution, rinse) prior to film curing. The aqueous autodeposition coating composition has a pH of 1.6 to 5.0 and contains(i) water-dispersible or water-soluble organic film-forming resin,(ii) at least one of fluoride ions or fluoride ions and complex fluoride ions,(iii) hexavalent chromium ion or hexavalent chromium ion+trivalent chromium ion, and(iv) tungstate ion and/or molybdate ion.
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: April 23, 1996
    Assignee: Henkel Corporation
    Inventors: Takumi Honda, Kazuhisa Naito, Mitsuyuki Koga
  • Patent number: 5141575
    Abstract: Zinciferous surfaces, particularly those of galvanized steel, may be effectively protected against corrosion, either as treated or after painting, while remaining easy to weld, by contact with an aqueous solution containing chromium in both +6 and +3 valence states, phosphate, a tertiary alcohol or similar oxidation stable, water soluble organic compound as a wetting agent, and a silane coupling agent, followed by drying with a film from the solution still in place on the surface. A thin coating containing 10-200 mg/m.sup.2 of chromium is formed on the surface to provide a protective layer that is also an excellent base for paint.
    Type: Grant
    Filed: April 5, 1990
    Date of Patent: August 25, 1992
    Assignee: Henkel Corporation
    Inventors: Noriaki Yoshitake, Kenshi Saeki, Takumi Honda, Takao Ogino
  • Patent number: 4959277
    Abstract: The present invention relates to a process for surface treatment for cathodic electrodeposit coating of a zinc-plated or zinc alloy-plated steel sheet comprising coating and drying a protective coating material on said steel sheet chromate-treated beforehand, to form a protective film before subjecting the sheet to the cathodic electrodeposit coating, which comprises coating a protective coating material having as a principal constituent of film-forming organic component a block isocyanate-containing prepolymer containing in one and the same molecule respectively at least one blocked isocyanate group, hydroxyl group, and tertiary amono group and containing 10-100 parts by weight of silica sol relative to 100 parts by weight of said prepolymer, in an amount of 0.3 g-4 g/m.sup.2, and then heat-drying the same.
    Type: Grant
    Filed: December 1, 1989
    Date of Patent: September 25, 1990
    Assignees: Nihon Parkerizing Co., Ltd., Mitsubishi Kasei Corporation
    Inventors: Kenshi Saeki, Takao Ogino, Noriaki Yoshitake, Takumi Honda, Akira Nishihara, Hiroshi Okita, Yukio Tsuge, Haruo Iizuka