Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4809780 | Method for sealing thief zones with heat-sensitive fluids | — | 1989-03-07 |
JS
Joseph Shen
Overall (1989): #92,898 of 140,708Top 70%
1
Patents 1989