Patents by Inventor Katsuyki Ohba

Katsuyki Ohba 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).

  • Non-oriented silicon steel sheet with stable magnetic properties
    Patent number: 4338143
    Abstract: A non-oriented silicon steel sheet with a low watt loss value as well as uniform magnetic properties which contains 1.5-3.5% Si, an exceedingly low C content, and a low soluble Al content, and has a ratio of B to N in the range of 0.4 to 2.0, and further contains at least one rare earth element.
    Type: Grant
    Filed: March 27, 1981
    Date of Patent: July 6, 1982
    Assignee: Nippon Steel Corporation
    Inventors: Yoshiaki Shimoyama, Shigenobu Koga, Katsuyki Ohba