Patents by Inventor Shuichi Asahina

Shuichi Asahina 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: 5997714
    Abstract: The invention provides a material coated with an organic film which exhibits excellent corrosion resistance and lacquer adhesion. The invention includes an electroconductive substrate coated with an electrolytically polymerized coating film containing chromium. Particularly, a zinc-type plated steel sheet coated with an electrolytically polymerized coating film containing chromium in accordance with the invention is well suited for application in vehicle bodies. The invention further provides a method of making a material coated with an organic film which involves forming organic coating material containing chromium on an electroconductive substrate acting as an electrode by electrolytically polymerizing an organic monomer in an electrolyte solution containing chromium. The method provides a monolithic composite structure comprising chromium compounds and an organic coating film, and avoid the problems associated with passivation after chromium plating of steel.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: December 7, 1999
    Assignee: Kawasaki Steel Corporation
    Inventors: Kyoko Hamahara, Hisatada Nakakoji, Tomokatsu Katagiri, Shuichi Asahina, Kazuo Mochizuki
  • Patent number: 5834128
    Abstract: An organic film-coated plated steel sheet is disclosed which includes a base steel sheet, a zinc-base plated layer disposed thereon, and an organic film layer formed by cathodic polymerization of one or more monomers and superposed as an outermost layer on the zinc-base plated layer. The steel is excellent in corrosion resistance, weldability, electrodeposition paintability or paint adhesion and, thus, is suitable as a rust-proof steel sheet particularly for use in automobile bodies. Also disclosed is a process for producing that steel with less production equipment and reduced cost.
    Type: Grant
    Filed: August 28, 1996
    Date of Patent: November 10, 1998
    Assignee: Kawasaki Steel Corporation
    Inventors: Kyoko Hamahara, Shuichi Asahina, Hisatada Nakakoji, Tomokatsu Katagiri, Kazuo Mochizuki