Patents by Inventor Herbert C. Walther, Jr.

Herbert C. Walther, Jr. 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).

  • Determining the extent of entry of fluids into a borehole during drilling
    Patent number: 3968844
    Abstract: A method for determining when formation fluids enter the borehole during drilling of a well wherein a bypass is provided in the drill string above the back pressure valve and the pressure at the surface downstream of the mud pump is determined.
    Type: Grant
    Filed: September 19, 1974
    Date of Patent: July 13, 1976
    Assignee: Continental Oil Company
    Inventors: Herbert C. Walther, Jr., George M. Myers