Patents by Inventor Jun Nakatuka

Jun Nakatuka 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).

  • High-strength stainless steel foil for corrugating and process for producing the same
    Patent number: 5411610
    Abstract: According to the present invention, a strength of 120 to 200 kgf/mm.sup.2 in terms of 0.2% yield point and optionally a spring critical value of 55 to 150 kgf/mm.sup.2 are imparted to a high-strength stainless steel foil for corrugation by subjecting a thin sheet of a stainless steel comprising an alloy composed mainly of 10 to 40% by weight of Cr and 1 to 10% by weight of Al to final cold rolling and optionally subjecting the cold-rolled sheet to an aging treatment at a temperature in the range of from 80.degree. to 500.degree. C. after the completion of the final cold rolling. This enables corrugation to be effected at a high corrugation rate of 10 m/min or more.
    Type: Grant
    Filed: August 19, 1993
    Date of Patent: May 2, 1995
    Assignee: Nippon Steel Corporation
    Inventors: Jun Araki, Jun Nakatuka, Wataru Murata, Hidehiko Sumitomo, Masayuki Kasuya, Hitoshi Ota, Yuichi Kato, Masuhiro Fukaya, Keiichi Ohmura, Mikio Yamanaka, Fumio Fudanoki