Patents by Inventor David A. Hampel

David A. Hampel 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).

  • Method of drill bit manufacture and product
    Patent number: 4454205
    Abstract: A method for making a drill bit and product resulting therefrom in which carbide elements are coated with carbide and nitride materials such as those of titanium as by chemical vapor deposition after which the elements are cast in molten steel.
    Type: Grant
    Filed: October 9, 1981
    Date of Patent: June 12, 1984
    Assignee: ESCO Corporation
    Inventors: Ronald R. Miller, William R. Barber, Jr., David A. Hampel, James E. Ault
  • Excavating tooth
    Patent number: 4404760
    Abstract: An excavating tooth wherein the coupling between the point and the adapter is achieved through an external lock to convert lateral point unseating forces from shear to compression.
    Type: Grant
    Filed: February 24, 1982
    Date of Patent: September 20, 1983
    Assignee: Esco Corporation
    Inventors: Frecerick C. Hahn, William R. Barber, Jr., David A. Hampel
  • Excavating tooth
    Patent number: 4335532
    Abstract: An excavating tooth wherein the coupling between the point and the adapter is achieved through generally helical thread means with an external lock to prevent removal by reverse rotation relative to the direction of the helical thread means.
    Type: Grant
    Filed: February 25, 1981
    Date of Patent: June 22, 1982
    Assignee: ESCO Corporation
    Inventors: Frederick C. Hahn, William R. Barber, Jr., David A. Hampel