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David E. Griswold

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  • Corona Del Mar, CA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Fluid flow control device and method
    • Patent number 5,433,243
    • Issue date Jul 18, 1995
    • Griswold Controls
    • David E. Griswold
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Automatic fluid flow control and strainer device
    • Patent number 5,406,974
    • Issue date Apr 18, 1995
    • Griswold Controls
    • David E. Griswold
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Check valve
    • Patent number 4,452,272
    • Issue date Jun 5, 1984
    • Griswold Controls
    • David E. Griswold
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Backflow prevention apparatus
    • Patent number 4,364,408
    • Issue date Dec 21, 1982
    • Griswold Controls
    • David E. Griswold
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Check valve assembly
    • Patent number 4,333,495
    • Issue date Jun 8, 1982
    • Griswold Controls
    • David E. Griswold
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Backflow prevention apparatus
    • Patent number 4,276,897
    • Issue date Jul 7, 1981
    • Griswold Controls
    • David E. Griswold
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Check valve assembly
    • Patent number 4,244,395
    • Issue date Jan 13, 1981
    • Griswold Controls
    • David E. Griswold
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Backflow prevention apparatus
    • Patent number 4,244,392
    • Issue date Jan 13, 1981
    • Griswold Controls
    • David E. Griswold
    • E03 - WATER SUPPLY SEWERAGE