Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6281172 | Quaternary nitrogen containing amphoteric water soluble polymers and their use in drilling fluids | Brent Warren, Peter Marten Van Der Horst | 2001-08-28 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6281172 | Quaternary nitrogen containing amphoteric water soluble polymers and their use in drilling fluids | Brent Warren, Peter Marten Van Der Horst | 2001-08-28 |