D. Bernard Heffernan

Person

  • Harleysville, PA, US

Patents Grantslast 30 patents

  • Information Patent Grant

    Temporary sign holder

    • Patent number 6,386,492
    • Issue date May 14, 2002
    • National Railroad Passenger Corporation
    • David M. Brown
    • E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES