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| Number | Title | Issue Date |
| 4871204 | Touch bar release locking system The touch bar release locking system includes a hollow metal channel which affixes to a door at two points via insulating spacer blocks. Within the channel is housed a capacitive sensor which functions by detecting the additional capacitance coupled to th... | 10/03/1989 |
| 4682801 | Electromagnet access control circuit An electromagnetic lock for doors includes a large electromagnet mounted on the door frame, and a strike plate or armature secured to the door. A double-throw, double-pole type of relay or other switching circuit serves to selectively connect the electrom... | 07/28/1987 |
| 4516114 | Magnetic locking status detection system Magnetic door locks characteristically include a high strength electromagnet and a mating plate made of magnetically permeable material, or door strike, mounted on the door frame and the door, respectively. In addition, in order to determine whether the d... | 05/07/1985 |
