Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4586441 | Security system for selectively allowing passage from a non-secure region to a secure region | — | 1986-05-06 |
| 4530183 | Revolving door system | Stanley R. Heise, Michael D. Blackston, John L. B. Parselle | 1985-07-23 |
| 4475308 | Revolving door system | Stanley R. Heise, Michael D. Blackston, John L. B. Parselle | 1984-10-09 |
| 4458447 | Revolving door system | Stanley R. Heise, Michael D. Blackston | 1984-07-10 |