TREA

Michael B. Calhoun

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  • Carrollton, TX, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Well safety valve
    • Patent number 4,354,554
    • Issue date Oct 19, 1982
    • Otis Engineering Corporation
    • Michael B. Calhoun
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Well safety system
    • Patent number 4,276,937
    • Issue date Jul 7, 1981
    • Otis Engineering Corporation
    • Michael B. Calhoun
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Well tools
    • Patent number 4,160,478
    • Issue date Jul 10, 1979
    • Otis Engineering Corporation
    • Michael B. Calhoun
    • E21 - EARTH DRILLING MINING