Patents Assigned to Battelle Devepment Corporation
  • Well pump
    Patent number: 4688999
    Abstract: A well pump includes a piston and an inlet and/or outlet valve assembly of special structure. Each is formed of a body of organic polymer, preferably PTFE. Each includes a cavity in its upper portion and at least one passage leading from the cavity to the bottom of the block. A screen covers each cavity and a valve disk covers each screen. Flexible sealing flanges extend upwardly and downwardly from the periphery of the piston block. The outlet valve block has a sliding block and sealing fit with the piston rod.
    Type: Grant
    Filed: April 8, 1986
    Date of Patent: August 25, 1987
    Assignee: Battelle Devepment Corporation
    Inventors: Kenneth R. Ames, James M. Doesburg