Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5520419 | Apparatus for assembling bell and spigot pipe joints | Stephen L. DeBoalt, Howard H. O'Daniel | 1996-05-28 |
| 5426842 | Method of assembling bell and spigot pipe joints | Stephen L. DeBoalt, Howard H. O'Daniel | 1995-06-27 |
| 5197768 | Restrained joint having elastomer-backed locking segments | — | 1993-03-30 |
| 4685708 | Axially restrained pipe joint with improved locking ring structure | Van T. Walworth | 1987-08-11 |
| 4643466 | Pipe joint assembly with snap ring and associated method | Van T. Walworth | 1987-02-17 |
| 4524505 | Method of assembling a pipe joint | — | 1985-06-25 |
| 4456288 | Snap ring and restrained pipe joint using said snap-ring | — | 1984-06-26 |
| 4428604 | Restrained pipe joint and associated snap-ring | — | 1984-01-31 |