Patents by Inventor Robert D. Kuhlman, Jr.

Robert D. Kuhlman, 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).

  • Inverse differential casing cementing float valve
    Patent number: 4615394
    Abstract: The inverse differential fill-up casing cementing float valve comprises an annular valve housing, back pressure valve assembly, a first differential pressure check valve assembly, a second differential pressure check valve assembly, and cement filler material to retain the valve assemblies within the valve housing.
    Type: Grant
    Filed: May 2, 1985
    Date of Patent: October 7, 1986
    Assignee: Halliburton Company
    Inventor: Robert D. Kuhlman, Jr.