Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870025 | Method of sensing methane gas-I | Michael D. Hurley, William J. Kaiser | 1989-09-26 |
| 4841934 | Oxygen pumping device for control of the air fuel ratio | Robert E. Hetrick, Richard E. Soltis, William C. Vassell | 1989-06-27 |
| 4840913 | Oxides of nitrogen detector | Richard E. Soltis | 1989-06-20 |