Patents Represented by Law Firm Weber, Raithel, Malm & LaFave
  • Intensifier pump with integrated check valve
    Patent number: 4412792
    Abstract: A high pressure check valve for an intensifier cylinder and secured in the end of the cylinder so as to reduce the stress on the check valve due to cyclic loading.
    Type: Grant
    Filed: January 21, 1981
    Date of Patent: November 1, 1983
    Assignee: The Oilgear Company
    Inventors: Russell G. LaBorde, Gary S. Jendrzejek
  • Wireline safety check valve
    Patent number: 4266605
    Abstract: A check valve for wireline operations is employed in oil well drilling where a high pressure is encountered in a well. The check valve permits a wireline to extend through the check valve and a ball chamber therein. The ball chamber has a check ball therein that rests between the wireline and a non restrictive flow passage open to the well, so that upon loss of the wireline the fluid or gas tending to escape forces the ball to block the wireline opening.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: May 12, 1981
    Inventors: Russel G. LaBorde, Emmett F. Brieger