Issued Patents 1989
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883025 | Potential-magnetic energy driven valve mechanism | — | 1989-11-28 |
| 4878464 | Pneumatic bistable electronic valve actuator | Frederick L. Erickson | 1989-11-07 |
| 4875441 | Enhanced efficiency valve actuator | Frederick L. Erickson | 1989-10-24 |
| 4872425 | Air powered valve actuator | Frederick L. Erickson | 1989-10-10 |
| 4852528 | Pneumatic actuator with permanent magnet control valve latching | Frederick L. Erickson | 1989-08-01 |
| 4831973 | Repulsion actuated potential energy driven valve mechanism | — | 1989-05-23 |
| 4794890 | Electromagnetic valve actuator | — | 1989-01-03 |