Patents Assigned to National Bullet Proof, Inc.
  • Patent number: 4598647
    Abstract: A bulletproof door and door jamb construction includes a door jamb which includes a vertically and horizontally extending opening therein in an area where bullet shrapnel fragments can pass freely therethrough into the hollow interior of the door jamb so that the spent fragments lose their energy and do not enter the protected area behind the door by otherwise passing through the crack or space between the door and door jamb.
    Type: Grant
    Filed: March 16, 1984
    Date of Patent: July 8, 1986
    Assignee: National Bullet Proof, Inc.
    Inventor: Frederick F. Biedess