Did You Know...
...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7143545 | Security bar with multiple internal rolling bars and electronic monitoring A security bar providing improved security from breach is obtained with the use of a plurality of free rolling inner bars. Illustratively, three inner rolling bars, arranged in a triangular relationship, are provided inside a cylindrically hollowed out outer bar, th... | 12/05/2006 |
| 4982528 | Prison cell locking and unlocking device A prison cell door locking device which responds to four locking modes of a prison cell locking system which uses a master bar assembly controllable from a central location to (1) release the locks of all cells, (2) lock all of the cells, (3) allow key op... | 01/08/1991 |
| 4872284 | Cell block security systems A security system for detention cells is described. Known means are provided or lock to unlock the doors of all cells in a cell block. In combination with these means the present invention provides improved means for selectively unlocking the doors for in... | 10/10/1989 |
| 4723373 | Jail cell security systems A security system for a jail cell block is described. The individual cells are each provided by drop bar means which are shiftable between a position in which the cell door is locked and a position in which the door is released for opening movement. Deadl... | 02/09/1988 |
| 4641458 | Jail door operating and locking mechanism A jail door operating and locking mechanism is provided, comprising a sliding jail door mechanism, lockable by a vertical lock bar, and having a mechanism permitting selective manual operation of cell doors, as well as selective power operation of cell do... | 02/10/1987 |
