Patents by Inventor David A. Endresen

David A. Endresen 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).

  • Rupture disc assembly for pneumatic plugs
    Patent number: 8020577
    Abstract: A rupture disc assembly for pneumatic plugs constructed and arranged to cooperate with an aperture in an end casting or other plug component to expel excess air from the plug interior when a predetermined internal plug pressure is reached. The rupture disc holder assembly may have a two part body structure and be mounted to the inside or outside of the pneumatic plug. The rupture disc assembly utilizes a rupturable member in a flanged holder structure positioned in communication with the pneumatic plug.
    Type: Grant
    Filed: January 21, 2008
    Date of Patent: September 20, 2011
    Assignee: Cherne Industries Incorporated
    Inventors: Brent L. Gabel, David A. Endresen, Mark C. Bjorlin
  • Expandable plug and method of manufacture
    Publication number: 20040216794
    Abstract: An expandable plug device and a method for manufacturing the expandable plug. The expandable plug device has a sacrificial core which is used as an interior mold in the manufacturing process and which remains in the plug body after completion and during use. The expandable plug device is a multi-size plug having elastomeric and reinforcing layers and which may have an internal fluid flow-through conduit.
    Type: Application
    Filed: March 9, 2004
    Publication date: November 4, 2004
    Inventors: Thomas J Beckey, David A. Endresen