Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10517420 | Accelerated brewing system, method, and apparatus | Christopher W. Rahn, David Trojahn, Brent Friedrich | 2019-12-31 |
| 8011146 | Blast-proof window and mullion system | — | 2011-09-06 |
| 4583591 | Downhole locking apparatus | Mark E. Hopmann | 1986-04-22 |
| 4510995 | Downhole locking apparatus | Mark E. Hopmann | 1985-04-16 |
| 4437522 | Selective lock for anchoring well tools | Mark E. Hopmann | 1984-03-20 |
| 4287954 | Subsurface safety valve | Edwin C. Turner | 1981-09-08 |
| 4249599 | Well safety system | — | 1981-02-10 |