Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4520652 | System for obtaining exhaust samples and analyzing the same | Michael S. Englund, Joseph C. Hafele | 1985-06-04 |
| 4386534 | System for obtaining exhaust samples and analyzing the same | Michael S. Englund, Joseph C. Hafele | 1983-06-07 |