Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5216352 | Solid state current controlled interruption system | George H. Studtmann | 1993-06-01 |
| 5170310 | Fail-resistant solid state interruption system | George H. Studtmann, James V. Fixemer, Julius Michael Liptak | 1992-12-08 |
| 5137611 | Electrolytic plating one surface of conductive sheet | Timothy R. Roberts, Julie A. Heitzenrater, Larry E. Parrella | 1992-08-11 |
| 4631536 | Multiplex submersible pump telemetry system | James R. Tomashek | 1986-12-23 |
| 4581613 | Submersible pump telemetry system | James R. Tomashek | 1986-04-08 |
| 4202225 | Power tongs control arrangement | Loren B. Sheldon, James R. Tomashek | 1980-05-13 |
| 4187546 | Computer-controlled oil drilling rig having drawworks motor and brake control arrangement | James P. Heffernan, Loren B. Sheldon, James R. Tomashek | 1980-02-05 |