TREA

Baohai Liu

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  • Carol Stream, IL, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Gauge hatch with liquid seal
    • Patent number 6,629,621
    • Issue date Oct 7, 2003
    • The Protectoseal Company
    • Thomas C. Piotrowski
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Vent valve with liquid seal
    • Patent number 6,056,005
    • Issue date May 2, 2000
    • The Protectoseal Company
    • Thomas C. Piotrowski
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...