Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D945853 | Faceplate for a smart mullion controller | Gray P. DeRenzi, James T. Mielke | 2022-03-15 |
| RE38121 | Security vent | Robert A. Powell | 2003-05-20 |
| 6371846 | Method for ventilating secure facility and system and apparatus used therefor | Robert A. Powell | 2002-04-16 |
| 5976007 | Security vent | Robert A. Powell | 1999-11-02 |
| 5968216 | Security vent | Robert A. Powell | 1999-10-19 |