TREA

John M. Hemphill

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  • Lancaster, PA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Grid accent and ceiling boards
    • Patent number 4,885,889
    • Issue date Dec 12, 1989
    • Armstrong World Industries, Inc.
    • John M. Hemphill
    • E04 - BUILDING
  • Information Patent Grant

    Expansion clip on a ceiling runner
    • Patent number 4,580,386
    • Issue date Apr 8, 1986
    • Armstrong World Industries, Inc.
    • John M. Hemphill
    • E04 - BUILDING