Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9944556 | Compositions with synthetic gypsum and methods | Dennis Mark Lettkeman, John W. Wilson, Brian K. Ball, Raymond A. Kaligian, Doug Blackburn | 2018-04-17 |
| 9346996 | Oil well cementing products with synthetic gypsum and methods | Dennis Mark Lettkeman, John W. Wilson, Doug Blackburn, Brian K. Ball, Raymond A. Kaligian | 2016-05-24 |