Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4407329 | Magnetically operated fail-safe cutoff valve with pressure equalizing means | Donald L. Huebsch | 1983-10-04 |
| 4321946 | Armature position monitoring and control device | Donald L. Huebsch | 1982-03-30 |
| 4191248 | Tandem solenoid-controlled safety cut-off valve for a fluid well | Donald L. Huebsch | 1980-03-04 |