Issued Patents 2021
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11047840 | Reference gas management in a breath alcohol calibration station | Douglas Edward DeVries | 2021-06-29 |
| 10948468 | Fault-tolerant breath alcohol calibration station and method | Douglas Edward DeVries | 2021-03-16 |