Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5309676 | Balanced door closing apparatus | Edmund Dee | 1994-05-10 |
| 4872285 | Quarter point return mechanism for manually operated revolving doors | — | 1989-10-10 |
| 4800679 | Quarter point return mechanism for manually operated revolving doors | — | 1989-01-31 |
| 4332108 | Collapsible revolving door | — | 1982-06-01 |