Patents by Inventor Henri Chave

Henri Chave 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).

  • Extension rod for percussive drilling tool
    Patent number: 4061433
    Abstract: A composite extension rod for coupling a drilling tool and a hammer which is located outside of the drill hole and has a central tube surrounded by parallel high strength rods and an outer sheath which has coupling sleeves at its ends.
    Type: Grant
    Filed: July 20, 1976
    Date of Patent: December 6, 1977
    Assignee: Ugine Aciers
    Inventor: Henri Chave