Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9678990 | Construction drawing evaluation systems and methods | Douglas M. Elliott, John Ritzenthaler | 2017-06-13 |
| 9116923 | Construction drawing evaluation systems and methods | Douglas M. Elliot, John Ritzenthaler | 2015-08-25 |