TREA

Bernhardt & Frederick Co., Inc.

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  • San Bernardino, CA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Ball valve device with hold-open tube
    • Patent number 4,565,213
    • Issue date Jan 21, 1986
    • Bernhardt & Frederick Co., Inc.
    • Bernhardt F. Giebeler
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Pressure balanced ball valve device
    • Patent number 4,377,179
    • Issue date Mar 22, 1983
    • Bernhardt & Frederick Co., Inc.
    • Bernhardt F. Giebeler
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Kelly valve
    • Patent number 4,262,693
    • Issue date Apr 21, 1981
    • Bernhardt & Frederick Co., Inc.
    • Bernhardt F. Giebeler
    • E21 - EARTH DRILLING MINING

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