Issued Patents All Time
Showing 26–29 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867483 | Pipe connector device | Stephen P. Barrett, Tep Ungchusri, Roy Bates | 1989-09-19 |
| 4569370 | Balanced double cage choke valve | — | 1986-02-11 |
| 4489953 | Fire-safe seal for swivel joint | — | 1984-12-25 |
| 4431217 | Fire-safe seal for swivel joint | — | 1984-02-14 |