TREA

Charles W. Mayfield

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  • Youngstown, OH, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Door lock
    • Patent number 4,377,304
    • Issue date Mar 22, 1983
    • Youngstown Steel Door Company
    • Charles W. Mayfield
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
  • Information Patent Grant

    Door repair method and repair section therefor
    • Patent number 4,353,187
    • Issue date Oct 12, 1982
    • The Youngstown Steel Door Company
    • Oliver J. Jenkins
    • B61 - RAILWAYS