Robert H. Frickel

Person

  • Bel Air, MD, US

Patents Grantslast 30 patents

  • Information Patent Grant

    Method of forming a safe visual smoke screen

    • Patent number H769
    • Issue date Apr 3, 1990
    • The United States of America as represented by the Secretary of the Army
    • William G. Rouse
    • 102 - Ammunition and explosives