Patents by Inventor Warren C. Yohe

Warren C. Yohe 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).

  • Surface modified cemented carbides
    Patent number: 4913877
    Abstract: A cemented carbide cutting tool substrate has enhanced surface toughness due to binder enrichment and depletion of aluminum nitride near the peripheral surface.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: April 3, 1990
    Assignee: GTE Valenite Corporation
    Inventor: Warren C. Yohe
  • Surface modified cemented carbides
    Patent number: 4828612
    Abstract: A cemented carbide cutting tool substrate has enhanced surface toughness due to binder enrichment and depletion of aluminum nitride near the peripheral surface.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: May 9, 1989
    Assignee: GTE Valenite Corporation
    Inventor: Warren C. Yohe
  • Process for adhering an oxide coating on a cobalt-enriched zone, and articles made from said process
    Patent number: 4649084
    Abstract: An improved fabrication process for cobalt-enriched cemented carbide substrates is disclosed, in which an article is generally comprised of tungsten carbide, cobalt, and carbides, nitrides or carbonitrides of titanium, tantalum, and niobium, or mixtures thereof. In one aspect of the invention the article is contacted with nitrogen gas and then sintered in the absence of nitrogen gas to form a cobalt-enriched, B-1 phase-depleted zone. The article is then sintered in nitrogen gas to form a B-1 phase enriched layer on the surface of the article. Additionally, a metal oxide wear layer can be provided on the article.
    Type: Grant
    Filed: May 6, 1985
    Date of Patent: March 10, 1987
    Assignee: General Electric Company
    Inventors: Thomas E. Hale, Warren C. Yohe
  • Coated carbide cutting tool insert
    Patent number: 4548786
    Abstract: Cobalt cemented carbide cutting inserts are prepared for coating with a hard, wear-resistant coating by providing a cobalt enriched zone on a surface to be coated. Cobalt enrichment is effectuated by means of nitrogen gas contact with the carbide followed by a period of vacuum sintering during its sintering process of manufacture.
    Type: Grant
    Filed: April 28, 1983
    Date of Patent: October 22, 1985
    Assignee: General Electric Company
    Inventor: Warren C. Yohe