Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870137 | Novel n-substituted polyamide type polymers, their method of preparation and their use as additives for crude petroleum oils | Denis Lopez, Paul Maldonado, Luc Navascues | 1989-09-26 |