Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882405 | Terpolymers of acrylamide, alkylacrylamide and betaine monomers | Donald N. Schulz, Jan Bock, Enock Berluche | 1989-11-21 |
| 4880436 | Method for controlling viscosity of organic liquid and compositions | Kissho Kitano, Donald N. Schulz | 1989-11-14 |
| 4801498 | Substrates coated with neutralized carboxylated polymers | Pacifico V. Manalastas, Evelyn N. Drake | 1989-01-31 |