Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 5690390 | Process for solution mining underground evaporite ore formations such as trona | — | 1997-11-25 | $11,485,000 |
| 5238664 | Soda ash production | William R. Frint, William G. Fischer | 1993-08-24 | $8,728,000 |
| 5192164 | Soda ash production | William R. Frint, William G. Fischer | 1993-03-09 | $3,076,000 |
| 5043149 | Soda ash production | William R. Frint, William G. Fischer | 1991-08-27 | $11,836,000 |