Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4623181 | Entry closure assembly | Arthur Geringer, David Geringer | 1986-11-18 |
| 4609910 | Exit door security system | Arthur Geringer, David Geringer | 1986-09-02 |
| 4596411 | Door locking and monitoring assembly | Arthur Geringer, David Geringer | 1986-06-24 |