Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE31677 | Process for recovery of carbonaceous materials from subterranean deposits | David D. Heald, John C. McKinnell | 1984-09-18 |
| 4223734 | Process of breaking and rendering permeable a subterranean rock mass | — | 1980-09-23 |