Patents by Inventor Percival E. Warner

Percival E. Warner 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).

  • Sintered metal articles and process for their manufacture
    Patent number: 4271239
    Abstract: A sintered metal article such as a piston ring or a sealing ring (in particular those having a cross-section area not exceeding 20 mm.sup.2) having a density which is at least 88.5% of the theoretical density, having a fine machined surface finish, and having a nitrocarburized surface layer which is not found at a depth of more than about 250 microns from the surface.The invention also includes the process of manufacturing such an article.
    Type: Grant
    Filed: July 19, 1978
    Date of Patent: June 2, 1981
    Assignee: Brico Engineering Limited
    Inventors: Percival E. Warner, Paul Smith, Terence M. Cadle