TREA

William E. Perk

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  • Cleveland, OH, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Hollow-louvered ceilings
    • Patent number 4,680,910
    • Issue date Jul 21, 1987
    • William E. Perk
    • E04 - BUILDING
  • Information Patent Grant

    Louvered ceiling
    • Patent number 4,532,749
    • Issue date Aug 6, 1985
    • William E. Perk
    • E04 - BUILDING