Issued Patents All Time
Showing 1–25 of 37 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8111122 | Magnetic brake assembly | — | 2012-02-07 |
| 7504920 | Magnetic brake assembly | — | 2009-03-17 |
| 5300883 | Position sensor with variably coupled magnetic field conducting means | — | 1994-04-05 |
| 5284116 | Vehicle management computer | — | 1994-02-08 |
| 5259345 | Pneumatically powered actuator with hydraulic latching | — | 1993-11-09 |
| 5253619 | Hydraulically powered actuator with pneumatic spring and hydraulic latching | Frederick L. Erickson | 1993-10-19 |
| 5248123 | Pilot operated hydraulic valve actuator | Frederick L. Erickson | 1993-09-28 |
| 5224683 | Hydraulic actuator with hydraulic springs | — | 1993-07-06 |
| 5221072 | Resilient hydraulic actuator | Frederick L. Erickson | 1993-06-22 |
| 5203535 | Cam actuated valve assembly with hydraulic spring | Frederick L. Erickson | 1993-04-20 |
| 5189996 | Two-stroke-cycle engine with variable valve timing | Frederick L. Erickson | 1993-03-02 |
| 5152260 | Highly efficient pneumatically powered hydraulically latched actuator | Frederick L. Erickson | 1992-10-06 |
| 5131354 | Method of operating a two-stroke-cycle engine with variable valve timing in a four-stroke-cycle mode | — | 1992-07-21 |
| 5125371 | Spring driven hydraulic actuator | Fredrick L. Erickson | 1992-06-30 |
| 5123397 | Vehicle management computer | — | 1992-06-23 |
| 5122922 | Variable capacitive sensor element | — | 1992-06-16 |
| 5109812 | Pneumatic preloaded actuator | Frederick L. Erickson | 1992-05-05 |
| 5095242 | Low radio interference spark plug | — | 1992-03-10 |
| 5083533 | Two-stroke-cycle engine with variable valve timing | Frederick L. Erickson | 1992-01-28 |
| 5058538 | Hydraulically propelled phneumatically returned valve actuator | Frederick L. Erickson | 1991-10-22 |
| 5029516 | Pneumatically powered valve actuator | Frederick L. Erickson | 1991-07-09 |
| 5022358 | Low energy hydraulic actuator | — | 1991-06-11 |
| 5022359 | Actuator with energy recovery return | Frederick L. Erickson | 1991-06-11 |
| 5003938 | Pneumatically powered valve actuator | Frederick L. Erickson | 1991-04-02 |
| 4991548 | Compact valve actuator | Frederick L. Erickson | 1991-02-12 |