Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4928997 | Rotating union with carbon graphite labyrinthine seal | Dennis Pearson | 1990-05-29 |
| 4817995 | Rotating union with replaceable sealing assembly | Louis H. Deubler, Dennis Pearson | 1989-04-04 |