Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9944556 | Compositions with synthetic gypsum and methods | Dennis Mark Lettkeman, John W. Wilson, Mike L. Cloud, 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, Raymond A. Kaligian, Mike L. Cloud | 2016-05-24 |
| 7754007 | Gypsum mixtures for forming solids | Dennis Mark Lettkeman, John W. Wilson, Raymond A. Kaligian | 2010-07-13 |