William A. Hackman

Person

  • Grover City, CA, US

Patents Grantslast 30 patents

  • Information Patent Grant

    Window with automatic screen

    • Patent number 4,993,468
    • Issue date Feb 19, 1991
    • William A. Hackman
    • E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS