TREA

David C. Hamstra

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  • Clinton, IA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method and apparatus for detecting a blockage in a vapor flow line
    • Patent number 4,072,934
    • Issue date Feb 7, 1978
    • Wylain, Inc.
    • Trueman W. Hiller
    • B67 - OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS LIQUID...
  • Information Patent Grant

    Controlling circuit
    • Patent number 4,011,498
    • Issue date Mar 8, 1977
    • General Electric Company
    • David C. Hamstra
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Control system
    • Patent number 3,937,922
    • Issue date Feb 10, 1976
    • General Electric Company
    • David C. Hamstra
    • G05 - CONTROLLING REGULATING