Issued Patents 2016
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9518214 | Proppant with polyurea-type coating | Avis Lloyd McCrary, Robert Ray McDaniel, Ralph Edward Barthel | 2016-12-13 |
| 9290690 | Coated and cured proppants | Robert Ray McDaniel, Avis Lloyd McCrary, Ralph Edward Barthel | 2016-03-22 |