Patents by Inventor Shoji Dohi

Shoji Dohi 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).

  • Far-infrared emitter of high emissivity and corrosion resistance and method for the preparation thereof
    Patent number: 5338616
    Abstract: A far-infrared emitter of high corrosion resistance is prepared by an oxidizing heat treatment of a body made from a stainless steel of 20-35% by weight of chromium, 0.5-5.0% by weight of molybdenum, up to 3.0% by weight of manganese and up to 3.0% by weight of silicon at 900.degree.-1200.degree. C. to form an oxidized surface film having a thickness of at least 0.2 mg/cm.sup.2. Further, a far-infrared emitter of a high emissivity approximating a black body is prepared by subjecting a body made from a stainless steel of 10-35% by weight of chromium, 1.0-4.0% by weight of silicon and up to 3.0% by weight of manganese to a blasting treatment to roughen the surface followed by an oxidizing heat treatment at 900.degree.-1200.degree. C. to form an oxide film on the surface in the form of protrusions having a length of at least 5 .mu.m.
    Type: Grant
    Filed: April 8, 1993
    Date of Patent: August 16, 1994
    Assignees: Kawasaki Steel Corporation, Osaka Gas Co., Ltd.
    Inventors: Kazuhide Ishii, Tatsuo Kawasaki, Noriyuki Kuriyama, Shoji Dohi, Akio Nakashiba, Souhei Miyazaki
  • Ear-infrared emitter of high emissivity and corrosion resistance and method for the preparation thereof
    Patent number: 5213629
    Abstract: A far-infrared emitter of high corrosion resistance is prepared by an oxidizing heat treatment of a body made from a stainless steel of 20-35% by weight of chromium, 0.5-5.0% by weight of molybdenum, up to 3.0% by weight of manganese and up to 3.0% by weight of silicon at 900.degree.-1200 .degree. C. to form an oxidized surface film having a thickness of at least 0.2 mg/cm.sup.2. Further, a far-infrared emitter of a high emissivity approximating a black body is prepared by subjecting a body made from a stainless steel of 10-35% by weight of chromium, 1.0-4.0% by weight of silicon and up to 3.0% by weight of manganese to a blasting treatment to roughen the surface followed by an oxidizing heat treatment at 900.degree.-1200 .degree. C. to form an oxide film on the surface in the form of protrusions having a length of at least 5 .mu.m.
    Type: Grant
    Filed: May 1, 1992
    Date of Patent: May 25, 1993
    Assignees: Kasasaki Steel Corporation, Osaka Gas Co., Ltd.
    Inventors: Kazuhide Ishii, Tatsuo Kawasaki, Noriyuki Kuriyama, Shoji Dohi, Akio Nakashiba, Souhei Miyazaki
  • Carbonaceous ceramic composite for use in contact with molten nonferrous metal
    Patent number: 5135893
    Abstract: This invention provides a carbon-containing ceramic composite for molten non-ferrous metal, the composite being a sintered ceramic body to be used in contact with molten non-ferrous metal, the sintered body containing an aggregate of silicon carbide and/or silicone nitride, the sintered body being characterized in that it comprises,(a) 100 parts by weight of the aggregate,(b) 5 to 45 parts by weight of flake graphite, and(c) boron carbide in an amount of 10 to 40% by weight based on the flake graphite.
    Type: Grant
    Filed: November 30, 1990
    Date of Patent: August 4, 1992
    Assignee: Osaka Gas Company Limited
    Inventors: Shoji Dohi, Akio Nakashiba, Kengo Hamada, Shigenobu Yurugi, Hiroshi Sano, Yoshitaka Hayashi, Akira Nishihira, Hirokazu Asada, Mineyoshi Nishinou, Mamoru Imajo