Patents by Inventor Billie E. Belknap

Billie E. Belknap 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).

  • Borehole drilling apparatus
    Patent number: 4031970
    Abstract: A borehole drilling apparatus having a pneumatically driven hammer mounting a bit, a drill pipe connected to the hammer to supply operating compressed air to drive the hammer and to blow drilling debris therefrom, and a debris conduit in spaced circumscribing relation to the drill pipe having an open end adjacent to the hammer to receive air and debris therefrom and a remote opposite end to discharge said air and debris through the conduit.
    Type: Grant
    Filed: February 9, 1976
    Date of Patent: June 28, 1977
    Inventor: Billie E. Belknap