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| Number | Title | Issue Date |
| 5893235 | Removable security apparatus for building openings A removable security bar apparatus for preventing ingress to a building opening such as a window or door. The apparatus includes a grille and moveable latch remote from the opening. The apparatus may be quickly removed from the opening and used as a ladde... | 04/13/1999 |
| 4604838 | Modular mezzanine structure for a storage facility and method of assembly A modular mezzanine structure for ready attachment to preexisting storage cabinet structure is disclosed. Angle brackets attached to supporting feet are provided. The feet are inserted into apertures conventionally formed in the cabinets. Platforms may th... | 08/12/1986 |
| 4068770 | Foldable inclined multi-section ramp actuation system A foldable, articulated inclined ramp or stair assembly actuation system is shown and described. The assembly comprises at least three elements connected by hinges to each other and foldable on each other under the control of a series of pulleys interconn... | 01/17/1978 |
