Patents Represented by Attorney, Agent or Law Firm Ronald J. Knuth
  • Stainless steel having passive fluoride film formed thereon and equipment manufactured therefrom
    Patent number: 6699603
    Abstract: A stainless steel with a passive state fluorinated film formed thereon, which is easy to construct and does not produce particles even when it is welded, and a device using the same. The stainless steel does not cause leakage even when said film is formed on a sealing surface of a joint and a valve seat surface. The stainless steel is characterized in that at least a part of the surface coated with a passive state fluorinated film not thicker than 190Å consisting of a metal fluoride as a main component.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: March 2, 2004
    Assignee: Stella Chemifa Kabushiki Kaisha
    Inventors: Tadahiro Ohmi, Hirohisa Kikuyama, Masayuki Miyashita, Hiroto Izumi, Takanobu Kujime