Patents by Inventor Gerard P. Erpenbeck

Gerard P. Erpenbeck 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).

  • Precision roller bearing rock bits
    Patent number: 4793719
    Abstract: A sealed bearing roller cone rock bit is disclosed having precision roller bearings with very close fits. The bearing package includes highly refined and hardened surface finishes, special roller bearing metal materials and lubricants with specific lube viscosities.
    Type: Grant
    Filed: November 18, 1987
    Date of Patent: December 27, 1988
    Assignee: Smith International, Inc.
    Inventors: David P. Crockett, Gerard P. Erpenbeck, Michael E. Hooper