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| Number | Title | Issue Date |
| 5857291 | Astragal with integral sealing lock block An improved astragal assembly for use with a double door installation includes an astragal strip secured along the vertical edge of the inactive door. A lock block is slidably disposed in at least one end of said astragal strip and can be moved between an... | 01/12/1999 |
| 4787111 | Selectively-retractable elevated walkway extension A selectively positionable extension for an elevated walkway includes a planar ramp mounted by rollers to a frame and coupled to the frame by a selectively extensible hydraulic ram. The frame itself is supported by a second ramp for controlled vertical po... | 11/29/1988 |
| 4690040 | Snap-in screen frame and mounting for same An improved ventilation opening having a separate screen frame which is attached to the ventilation opening by pawls mounted on pawl arms, with the pawls inserted into pawl receiving openings in a crossbar on the ventilation opening and having means to mo... | 09/01/1987 |
| 4663887 | Apparatus for controlling the closing sequence of double doors An apparatus is described for regulating the closing sequence of double doors, each of which is provided with a floor-mounted door closer. In this arrangement an actuating unit is integrated into the floor-mounted door closer associated with the trailing ... | 05/12/1987 |
| 4294049 | Quick opening internal manway for towers A manway cover is formed using two like door panels made of lightweight, corrosion-resistant material which are hand operable from either side of the manway and can be installed without tools.... | 10/13/1981 |
