Patents by Inventor Bruce C. Christensen

Bruce C. Christensen 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).

  • Pressure equalizing valve
    Patent number: 4877057
    Abstract: A pressure equalizing valve comprises a valve body with a longitudinally disposed bore therein, and a spool disposed in the bore for longitudinal movement to regulate fluid communication from an inlet port to outlet ports in response to a pressure differential between first and second sense ports disposed on first and second end faces of the valve body.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: October 31, 1989
    Assignee: Wormald, U.S. Inc.
    Inventor: Bruce C. Christensen
  • Pressure equalizing valve
    Patent number: 4722358
    Abstract: A pressure equalizing valve comprises a valve body with a longitudinally disposed bore therein, and a spool disposed in the bore for longitudinal movement to regulate fluid communication from an inlet port to outlet ports in response to a pressure differential between first and second sense ports disposed on first and second end faces of the valve body.
    Type: Grant
    Filed: March 12, 1986
    Date of Patent: February 2, 1988
    Assignee: Wormald U.S., Inc.
    Inventor: Bruce C. Christensen
  • Pneumatic time delay valve
    Patent number: 3990516
    Abstract: A valve body contains a coaxially slidably valve element with a seal member at the upstream end and a pair of differential area pistons at the other end. Fluid passage means direct fluid from the upstream end to a zone between the pistons to cause the pistons to seat the seal member. An orifice in the downstream, larger area piston bleeds fluid to an accumulator of preselected volume. Once the pressure forces on the large piston balance, the pressure force on the small piston unseat the seal member.
    Type: Grant
    Filed: October 8, 1975
    Date of Patent: November 9, 1976
    Assignee: The Ansul Company
    Inventors: Bruce C. Christensen, Roy C. Emmes