Patents Assigned to Sunoco Products Company
  • Self venting plunger
    Patent number: 5878922
    Abstract: A self-venting cartridge plunger including openings defined therein and forming through air passages, each opening having an associated valve flap hinge-joined to the plunger and movable to close the opening upon the plunger encountering a greater resistance to movement than the flow of evacuating air.
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: March 9, 1999
    Assignee: Sunoco Products Company
    Inventor: David E. Boring