Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11236575 | Rotating control device with multiple seal cartridge | Earl Dietrich, Christian Leuchtenberg, Philip J. Engelman, Jeffrey S. Meister, Nicolas A. Haugen | 2022-02-01 |
| 8607815 | Butterfly valves with undulating sealing surface | Robert A. Hansen | 2013-12-17 |
| 8256450 | Butterfly valves with undulating sealing surface | Robert A. Hansen | 2012-09-04 |
| 7963207 | Vibrator | Robert A. Hansen | 2011-06-21 |