Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12291485 | Gypsum cement compositions with aggregate stabilizers and methods for forming floor underlayment | Karl Glenn Niessner, Dennis Mark Lettkeman, John W. Wilson | 2025-05-06 |
| 10662114 | Ultra-light cementitious compositions and related methods | Dennis Mark Lettkeman, John W. Wilson, Gary F. Miller, Raymond A. Kaligian | 2020-05-26 |
| 9975808 | Ultra-light cementitious compositions and related methods | Dennis Mark Lettkeman, John W. Wilson, Gary F. Miller, Raymond A. Kaligian | 2018-05-22 |
| 9708220 | Cementitious patch compositions and methods | Dennis Mark Lettkeman, John W. Wilson, Raymond A. Kaligian | 2017-07-18 |
| 7504165 | High strength flooring compositions | Dennis Mark Lettkeman, John W. Wilson | 2009-03-17 |
| 7338990 | High molecular weight additives for calcined gypsum and cementitious compositions | Dennis Mark Lettkeman, Raymond A. Kaligian, Eldon L. Whiteside | 2008-03-04 |
| 7056964 | High strength flooring compositions | Dennis Mark Lettkeman, Raymond A. Kaligian, Eldon L. Whiteside, Sharon Meiseman | 2006-06-06 |