Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6722452 | Pantograph underreamer | Lawrence W. Diamond, Joseph A. Zupanick, Harold E. Payne | 2004-04-20 |
| 6681855 | Method and system for management of by-products from subterranean zones | Joseph A. Zupanick | 2004-01-27 |