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Mark A. Johnson

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  • Detroit, MI, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Door safety device
    • Patent number 7,712,257
    • Issue date May 11, 2010
    • Mark A. Johnson
    • E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS

Patents Applicationslast 30 patents

  • Information Patent Application

    DOOR SAFETY DEVICE
    • Publication number 20100218426
    • Publication date Sep 2, 2010
    • Mark A. Johnson
    • E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
  • Information Patent Application

    Door safety device
    • Publication number 20080190029
    • Publication date Aug 14, 2008
    • Mark A. Johnson
    • E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS