Patents by Inventor David Onstenk

David Onstenk 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).

  • Check valve
    Patent number: 6817374
    Abstract: In one embodiment, a check valve includes an outer region and a central region. One or more cuts wind from the outer region towards the central region. In the presence of flow along one direction, the check valve opens by extending the central region away from the outer region. In the presence of flow in the reverse direction, the check valve closes by retracting the central region towards the outer region.
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: November 16, 2004
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: David Onstenk, Erik E. Erlandson
  • Check valve
    Publication number: 20040060593
    Abstract: In one embodiment, a check valve includes an outer region and a central region. One or more cuts wind from the outer region towards the central region. In the presence of flow along one direction, the check valve opens by extending the central region away from the outer region. In the presence of flow in the reverse direction, the check valve closes by retracting the central region towards the outer region.
    Type: Application
    Filed: September 29, 2003
    Publication date: April 1, 2004
    Inventors: David Onstenk, Erik E. Erlandson
  • Check valve
    Patent number: 6668849
    Abstract: In one embodiment, a check valve includes an outer region and a central region. One or more cuts wind from the outer region towards the central region. In the presence of low along one direction, the check valve opens by extending the central region away from the outer region. In the presence of flow in the reverse direction, the check valve closes by retracting the central region towards the outer region.
    Type: Grant
    Filed: March 8, 2002
    Date of Patent: December 30, 2003
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: David Onstenk, Erik E. Erlandson
  • Check valve
    Publication number: 20030168103
    Abstract: In one embodiment, a check valve includes an outer region and a central region. One or more cuts wind from the outer region towards the central region. In the presence of low along one direction, the check valve opens by extending the central region away from the outer region. In the presence of flow in the reverse direction, the check valve closes by retracting the central region towards the outer region.
    Type: Application
    Filed: March 8, 2002
    Publication date: September 11, 2003
    Inventors: David Onstenk, Erik E. Erlandson