Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4915169 | Method for controlling the pH of steam fluids using heterocyclic, multifunctional, nitrogen-containing compounds | Andrew Nigrini, Marion G. Reed | 1990-04-10 |
| 4871023 | Method for controlling the pH of steam fluids | Andrew Nigrini | 1989-10-03 |