Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4360234 | In-situ method and apparatus for sparging gas bubbles | Limin Hsueh, Robert A. Hard, Donald H. Davidson | 1982-11-23 |
| 4342484 | Well stimulation for solution mining | Donald H. Davidson | 1982-08-03 |