Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4797450 | Additives for water-base drilling fluid and process | David C. Dehm | 1989-01-10 |
| 4644035 | Process for sulfonating of polymers containing dicarboxylic acid cyclic imide units | David C. Dehm | 1987-02-17 |
| 4618655 | Process for preparation of polymers containing dicarboxylic acid cyclic imide units in a solid/liquid slurry | David C. Dehm | 1986-10-21 |