Patents by Inventor Emmett F. Brieger

Emmett F. Brieger 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).

  • 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