Issued Patents 1982
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4354699 | Apparatus for delaying opening of doors | — | 1982-10-19 |
| 4328985 | Timing apparatus for delaying opening of doors | — | 1982-05-11 |
| 4324425 | Point-of-egress control device for securing exit doors safely | — | 1982-04-13 |
| 4314722 | Timing apparatus for delaying opening of doors | — | 1982-02-09 |