Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D297847 | Heavy wall drill pipe | Gregg S. Perkin, Alonzo L. DeCell | 1988-09-27 |
| 4771811 | Heavy wall drill pipe and method of manufacture of heavy wall drill pipe | Alonzo L. DeCell, Gregg S. Perkin | 1988-09-20 |
| 4674171 | Heavy wall drill pipe and method of manufacture of heavy wall drill pipe | Alonzo L. DeCell, Gregg S. Perkin | 1987-06-23 |