Patents by Inventor Lawrence W. Berger

Lawrence W. Berger 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).

  • Anchor device
    Patent number: 4941532
    Abstract: An oil well tubing anchor for anchoring in large diameter casing after passing through small diameter casing where the anchor employs wall engaging members on the end of pivotally supported arm members and an expander for sequentially moving the arm members radially by use of cooperating, differently inclined surfaces. The tool is moved between collapsible and expandable position by rotations.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: July 17, 1990
    Assignee: Elder Oil Tools
    Inventors: Floyd R. Hurt, Lawrence W. Berger