Patents by Inventor Chantal Gral

Chantal Gral 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-stainless steel nitrided piston ring, and method of making the same
    Patent number: 6485026
    Abstract: A piston ring is broadly defined as a ring-shaped, non-stainless steel, iron alloy that is nitrided, and includes between about 1% and about 10% chromium by weight, and preferably includes between about 1% and about 2% chromium by weight, with additional alloying elements also included.
    Type: Grant
    Filed: October 4, 2000
    Date of Patent: November 26, 2002
    Assignee: Dana Corporation
    Inventors: Hélène Hubert, Chantal Gral