David A. Crown

Person

  • Waconia, MN, US

Patents Grantslast 30 patents

  • Information Patent Grant

    Hydraulic leveraged overhead door assembly

    • Patent number 8,714,229
    • Issue date May 6, 2014
    • Crown Industries, Inc.
    • David A. Crown
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
  • Information Patent Grant

    Door assembly

    • Patent number 7,814,957
    • Issue date Oct 19, 2010
    • David A Crown
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES

Patents Applicationslast 30 patents

  • Information Patent Application

    HYDRAULIC LEVERAGED OVERHEAD DOOR ASSEMBLY

    • Publication number 20130319623
    • Publication date Dec 5, 2013
    • CROWN INDUSTRIES, INC.
    • David A. Crown
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
  • Information Patent Application

    Door Assembly

    • Publication number 20080086947
    • Publication date Apr 17, 2008
    • David A. Crown
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES