Abstract: A method of making a transparent panel is provided. The transparent panel effectively blocks the penetration of a bullet when fired from one side of the panel, but not when fired from the other side of the panel. The method comprises forming a sheet of acrylic resin and a sheet of polycarbonate resin, both of equal size and configuration. A sealing strip is applied completely around the peripheral edge of one of the sheets and the two sheets are then brought together, being spaced apart by the sealing strip. Two holes are then drilled into one of the two sheets at locations spaced at diagonally opposite corner edges of the sheet. Under pressure applied to the opposite faces of the two sheets, a liquid resin is injected into the space between the two sheets through one of the two holes until the entire volume between the two sheets is filled. Then the resin is permitted to harden.

Abstract: A bullet-proof panel comprising an outer panel of polycarbonate resin, a middle panel of ceramic tile and a second sheet of polycarbonate resin attached thereto, all of said layers being bonded together by a polyurethane adhesive. In the second embodiment of the present invention useful for preventing the penetration of high-velocity bullets, a third layer of polycarbonate resin is attached to the second layer of polycarbonate resin.

Abstract: A transparent panel having unidirectional bullet-resisting characteristics, comprises an outer transparent panel of an acrylic resin; an inner transparent sheet of a polycarbonate resin; and a transparent adhesive bonding the two sheets together. Also described are a method of making such a panel, and presses useful in making such a panel.