Patents by Inventor Tadashi Imoto

Tadashi Imoto 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).

  • Vacuum refining furnace
    Patent number: 6162387
    Abstract: A refining furnace used for vacuum refining has a sealing cover mounted on the refining furnace so as to cover the furnace throat of the refining furnace and to be in close contact with a sealing flange (10) formed on the refining furnace. The adhesion of metal and slag to the sealing flange is prevented without using any flange cover. A sealing flange (10) is formed on the outer surface of the refining furnace (1) at a position on a conical part (8) extending between the furnace throat (9) and a straight body part or on the straight body part. A slag-stopping dummy flange (11) is formed on the outer surface of the refining furnace (1) at a position between a furnace throat (9) and the sealing flange (10). The slag-stopping dummy flange (11) has an outer circumference lying on the inner side of the inner circumference of a sealing cover (4) and on the outer side of the inner circumference of a lower end part of a dust collecting hood for atmospheric refining.
    Type: Grant
    Filed: September 18, 1998
    Date of Patent: December 19, 2000
    Assignee: Nippon Steel Corporation
    Inventors: Kensuke Shimomura, Tadashi Imoto, Mayumi Okimori, Gaku Ogawa, Tomoaki Tanaka
  • Filament-like fibers and bundles thereof, and novel process and apparatus for production thereof
    Patent number: 4521364
    Abstract: A novel filament composed of at least one thermoplastic synthetic polymer, said filament being characterized by having (1) an irregular variation in the size of its cross section along its longitudinal direction, and (2) a coefficient of intrafilament cross-sectional area variation [CV(F)] of 0.05 to 1.0; and a novel bundle of said filament.
    Type: Grant
    Filed: July 2, 1982
    Date of Patent: June 4, 1985
    Assignee: Teijin Limited
    Inventors: Susumi Norota, Tsutomu Kiriyama, Tadashi Imoto, Toshinori Azumi
  • Filament-like fibers and bundles thereof, and novel process and apparatus for production thereof
    Patent number: 4429006
    Abstract: A novel filament composed of at least one thermoplastic synthetic polymer, said filament being characterized by having (1) an irregular variation in the size of its cross section along its longitudinal direction, and (2) a coefficient of intrafilament cross-sectional area variation [CV(F)] of 0.05 to 1.0; and a novel bundle of said filament.
    Type: Grant
    Filed: July 2, 1982
    Date of Patent: January 31, 1984
    Assignee: Teijin Limited
    Inventors: Susumu Norota, Tsutomu Kiriyama, Tadashi Imoto, Toshinori Azumi
  • Novel filament-like fibers and bundles thereof, and novel process and apparatus for production thereof
    Patent number: 4355075
    Abstract: A novel filament composed of at least one thermoplastic synthetic polymer, said filament being characterized by having (1) an irregular variation in the size of its cross section along its longitudinal direction, and (2) a coefficient of intrafilament cross-sectional area variation [CV(F)] of 0.05 to 1.0; and a novel bundle of said filament.
    Type: Grant
    Filed: March 24, 1980
    Date of Patent: October 19, 1982
    Assignee: Teijin Limited
    Inventors: Susumu Norota, Tsutomu Kiriyama, Tadashi Imoto, Toshinori Azumi