Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5531105 | Method and system for determining engine oil consumption | Alex D. Colvin, Keith R. Carduner | 1996-07-02 |
| 5129257 | System for measuring engine exhaust constituents | Keith R. Carduner, Alex D. Colvin | 1992-07-14 |