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John Holland Campbell

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  • Lafayette, LA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Suction valve apparatus and method of using same
    • Patent number 11,661,929
    • Issue date May 30, 2023
    • John H. Campbell
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Suction valve switch
    • Patent number D968599
    • Issue date Nov 1, 2022
    • John H. Campbell
    • D24 - Medical and laboratory equipment
  • Information Patent Grant

    Architectural blocks
    • Patent number 5,830,032
    • Issue date Nov 3, 1998
    • John Holland Campbell
    • A63 - SPORTS GAMES AMUSEMENTS

Patents Applicationslast 30 patents