Patents Represented by Attorney Fred L. Sinder

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  • Ferrofluid piston pump for use with heat pipes or the like
    Patent number: 5005639
    Abstract: A long life, very low friction pump for use in a heat pipe pump or the like is disclosed. A first pump uses magnetically confined ferrofluid rings as both sealer and lubricant for a sliding pump piston in a two sided piston pump that minimizes the seal pressures on both sides of the ferrofluid seals. A second pump uses a magnetically confined ferrofluid slug as a self-sealing and self-repairing pump piston.
    Type: Grant
    Filed: April 2, 1990
    Date of Patent: April 9, 1991
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: John E. Leland