Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4353482 | Additive metering control system | Stephen F. Crain | 1982-10-12 |
| 4265266 | Controlled additive metering system | Gerald C. Kierbow, Herbert J. Horinek, Stephen F. Crain | 1981-05-05 |