Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5218038 | Phenolic resin coated proppants with reduced hydraulic fluid interaction | Calvin R. Johnson, Kwok-tuen Tse | 1993-06-08 |
| 4848470 | Process for removing flow-restricting materials from wells | — | 1989-07-18 |