Patents by Inventor Donald D. Frank

Donald D. Frank 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).

  • Drill bit with suction and method of dry drilling with liquid column
    Patent number: 4022285
    Abstract: A drill bit for drilling deep wells such as oil wells has a cone at the bottom and a fluid bore at the top. The fluid is directed by nozzles upward through a passageway so that the cone is maintained free of fluid and the cuttings from the cone are picked up by suction and carried through the discharge passageway. The jet from the discharge passageway supports the column of fluid surrounding the drill stem.
    Type: Grant
    Filed: March 11, 1976
    Date of Patent: May 10, 1977
    Inventor: Donald D. Frank