Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11053432 | Ultra high strength proppant and method of preparing the same | Carl Sorrell, Howard M. Winkelbauer, Craig Searchfield | 2021-07-06 |
| 8772207 | Spherical pellets containing common clay particulate material useful as a proppant in hydraulic fracturing of oil and gas wells | David Glenn Hall, Carlton Frazier Sorrell, Gary Davis, Richard F. Watkins | 2014-07-08 |