TREA

Harold W. Johnson JR.

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  • Midlothian, VA, US
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Patents Applicationslast 30 patents

  • Information Patent Application

    Filtration system underdrain
    • Publication number 20040055944
    • Publication date Mar 25, 2004
    • Ondeo Degremont, Inc.
    • John D. Dyson
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Application

    Automatic backwash filter system
    • Publication number 20030230525
    • Publication date Dec 18, 2003
    • ONDEO Degremont, Inc.
    • Jack H. Jessop
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL