Issued Patents All Time
Showing 26–32 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4826223 | Electromagnetic door lock device | Richard Geringer, David Geringer | 1989-05-02 |
| 4641867 | Door closure assembly | Richard Geringer, David Geringer | 1987-02-10 |
| 4634155 | Power actuated door locking and monitoring assembly | Richard Geringer, David Geringer | 1987-01-06 |
| 4623178 | Lock assembly | Richard Geringer, David Geringer | 1986-11-18 |
| 4623181 | Entry closure assembly | Richard Geringer, David Geringer | 1986-11-18 |
| 4609910 | Exit door security system | Richard Geringer, David Geringer | 1986-09-02 |
| 4596411 | Door locking and monitoring assembly | Richard Geringer, David Geringer | 1986-06-24 |