Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6742301 | Revolving door with metal detection security | — | 2004-06-01 |
| 5201906 | Anti-piggybacking: sensor system for security door to detect two individuals in one compartment | Robert Mayer | 1993-04-13 |
| 5097454 | Security door with improved sensor for detecting unauthorized passage | Robert Mayer | 1992-03-17 |
| 5012455 | Security door with improved sensor for detecting unauthorized passage | Robert Mayer | 1991-04-30 |
| RE33407 | Revolving door control system | — | 1990-10-30 |
| 4627193 | Revolving door control system | — | 1986-12-09 |
| 4581849 | Revolving door control | — | 1986-04-15 |