Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4804422 | Method of purifying quartz sand | Emmanuel Papanikolau | 1989-02-14 |
LE
Leonard T. M. Ebben
Overall (1989): #34,148 of 140,708Top 25%
1
Patents 1989