Patents by Inventor Fredrich G. Moir

Fredrich G. Moir 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).

  • Liquid-driven downhole hammer drill
    Patent number: 5497839
    Abstract: A drill stem arrangement and method in which the motor for providing the hammer action is in the drill stem near to the drill bit. The motor is driven by pressurised liquid and a proportion of the liquid is used for flushing drill cuttings and cooling the drill bit.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: March 12, 1996
    Assignee: SDS Pty Ltd.
    Inventor: Fredrich G. Moir