Patents by Inventor Hirotada Katoh

Hirotada Katoh 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).

  • Insulating coating compositions applied on electrical steel sheets
    Patent number: 4288492
    Abstract: A coating composition including inorganic compounds dispersed in an organic material capable upon exposure to UV rays or electron beams of producing an adherent insulating film of high dielectric properties on the surfaces of electro-sheets of ferrous material. The coated electro-sheets are annealed after the forming, for example, cutting or punching operation in order to remove thereby imparted stresses without impairing the dielectric properties.
    Type: Grant
    Filed: February 4, 1980
    Date of Patent: September 8, 1981
    Assignee: Nippon Steel Corporation
    Inventors: Yoshitaka Hiromae, Kazuo Nakamura, Toshiya Wada, Hirotada Katoh
  • Annealing separator for heat treatment of silicon steel sheets
    Patent number: 3956029
    Abstract: Annealing separator for heat treatment of a silicon steel sheet comprising not more than 0.2% SO.sub.3, not more than 0.04% Cl with the balance being MgO and unavoidable impurities, and having a bulk density between 0.18 and 0.30 g/cm.sup.3, and a particle size distribution of 40 to 70% of particles not larger than 3.mu.m, 10 to 25% of particles not smaller than 10.mu.m, not more than 15% of coarse particles larger than 15.mu.m with the balance being intermediate particles between 3.mu.m and 10.mu.m.
    Type: Grant
    Filed: May 31, 1974
    Date of Patent: May 11, 1976
    Assignee: Nippon Steel Corporation
    Inventors: Takaaki Yamamoto, Osamu Tanaka, Hirotada Katoh, Shozaburo Nakashima