TREA

John D. Petro

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  • Hubbard, OH, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Magnetic detent joy stick and stack remote control valves
    • Patent number 4,777,981
    • Issue date Oct 18, 1988
    • Commercial Shearing, Inc.
    • John D. Petro
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Gear pump or motor with tooth tips of dissimilar metal
    • Patent number 4,682,939
    • Issue date Jul 28, 1987
    • Commercial Shearing, Inc.
    • John D. Petro
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Hydraulic valve inlet unloaders
    • Patent number 4,569,367
    • Issue date Feb 11, 1986
    • Commercial Shearing, Inc.
    • John D. Petro
    • F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
  • Information Patent Grant

    Hydraulic valves
    • Patent number 4,519,419
    • Issue date May 28, 1985
    • Commercial Shearing, Inc.
    • John D. Petro
    • F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
  • Information Patent Grant

    Hydraulic valves
    • Patent number 4,519,420
    • Issue date May 28, 1985
    • Commercial Shearing, Inc.
    • John D. Petro
    • F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
  • Information Patent Grant

    Control and relief valves
    • Patent number 4,338,962
    • Issue date Jul 13, 1982
    • Commercial Shearing, Inc.
    • John D. Turko
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Compensated work port fluid valves
    • Patent number 4,187,877
    • Issue date Feb 12, 1980
    • Commercial Shearing Inc.
    • Robert F. Hodgson
    • F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
  • Information Patent Grant

    Compensated work port fluid valves and work port compensators
    • Patent number 4,058,135
    • Issue date Nov 15, 1977
    • Commercial Shearing, Inc.
    • John D. Petro
    • G05 - CONTROLLING REGULATING