Patents by Inventor David E. Drake

David E. Drake 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).

  • Hammer bit retention tool
    Patent number: 5065827
    Abstract: A retention system is disclosed for a hammer-percussion bit assembly which prevents the loss of the lower section of bit after a crack propagates through the shank (rotational drive) section of the bit. The system includes retainer which is mounted onto the drive sub of the assembly. The retainer is adapted to extend around the head section of the bit and functions to grab the severed bit head section upon lifting of the drill string while not interfering with the normal operation of the assembly.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: November 19, 1991
    Assignee: Smith International, Inc.
    Inventors: John A. Meyers, David E. Drake, Charles W. Witt