| 主权项 |
1. A security door, comprising:
a frame comprising structural members selected from the group consisting of steel, metal, stainless steel, copper, bronze, aluminum, titanium, wood, graphite polymer, graphene polymer, high density polyethylene polymers, nylon, and combinations thereof; and bullet resistant transparent or translucent panes comprising glass or synthetic material; said frame including a multi-layer exterior core, an interior core, an interior bullet proof grid plate, a window pane divider grid, and an exterior flat grid plate which holds said window panes within said window pane divider; said multi-layer exterior core including four flat frame members bonded to one another, said four frame members each comprising two vertical and two horizontal bands connected at four corners thus forming rectangular bands, a first T-shaped cavity being formed by outer marginal edges of said four rectangular bands, a second T-shaped cavity being formed by inner marginal edges of said four bands, a first T-shaped rectangular band being bonded into and around said first T-shaped cavity, a second T-shaped rectangular band being bonded into and around said second T-shaped cavity. |
