Patents by Inventor John N. Gilmer

John N. Gilmer 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).

  • Powdered metal valve seat insert
    Patent number: 4724000
    Abstract: Wear resistant articles, especially valve seat inserts for internal combustion engines, are produced as sintered metal compacts comprising interspersed microzones of prealloyed austenitic stainless steel and softer ferrous metal, the microzones of austenitic stainless steel containing carbides and carbonitrides. The sintered compacts can be made by forming a green compact from prealloyed austenitic stainless steel powder atomizate blended with softer powdered ferrous metal component and powdered carbon, and sintering the green compact.
    Type: Grant
    Filed: October 29, 1986
    Date of Patent: February 9, 1988
    Assignee: Eaton Corporation
    Inventors: Jay M. Larson, Sundaram L. Narasimhan, David L. Bonesteel, John N. Gilmer