Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 5014788 | Method of increasing the permeability of a coal seam | Rajen Puri, Dan Yee, Om Majahan | 1991-05-14 | $19,973,000 |
| 4747642 | Control of subsidence during underground gasification of coal | Bruce W. Gash | 1988-05-31 | $22,243,000 |