Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4411816 | Native petroleum surfactants | Teh F. Yen | 1983-10-25 |
| 4232738 | Petroleum recovery process using native petroleum surfactants | Teh F. Yen | 1980-11-11 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4411816 | Native petroleum surfactants | Teh F. Yen | 1983-10-25 |
| 4232738 | Petroleum recovery process using native petroleum surfactants | Teh F. Yen | 1980-11-11 |