Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4799200 | Method of acoustically detecting fractures in a borehole | — | 1989-01-17 |
PC
Philip Cheung
Overall (1989): #69,005 of 140,708Top 50%
1
Patents 1989