Patents by Inventor Alwyn H. Cheney

Alwyn H. Cheney 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).

  • Incompressible fluid type rock breaker
    Patent number: 4266827
    Abstract: A rock breaker comprising a tool insertable in a hole in a rock and fed through a supply line with an incompressible liquid to maintain a column of the liquid in the hole, and means to apply to the liquid a shock means sufficiently high to fracture the rock, the tool comprising a hollow stem having an expansible collet and a resilient sealing ring and mechanical means to expand the collet and ring.
    Type: Grant
    Filed: October 12, 1979
    Date of Patent: May 12, 1981
    Inventor: Alwyn H. Cheney