Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5096603 | Thermally stable hydrophobically associating rheological control additives for water-based drilling fluids | Dennis G. Peiffer, Jan Bock | 1992-03-17 |
| 5026490 | Zwitterionic functionalized polymers as deflocculants in water based drilling fluids | Dennis G. Peiffer, Jan Bock | 1991-06-25 |