Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9644742 | Two-stage seal for a valve | — | 2017-05-09 |
| 9255650 | Movable valve apparatus having conditioned lubricating surfaces | Wilbur Dean Hutchens | 2016-02-09 |
| 8899551 | Oblique mating surfaces in a valve assembly | — | 2014-12-02 |
| 8632053 | Movable valve apparatus having conditioned lubricating surfaces | Wilbur Dean Hutchens | 2014-01-21 |