Issued Patents 1997
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5700893 | Water-soluble cationic copolymers and their use as flocculants and drainage aids | Roger Yiming Leung, Kenneth S. Williams | 1997-12-23 |
| 5681912 | Water-soluble cationic copolymers and their use as flocculants and drainage retention aids | Roger Yiming Leung, Kenneth S. Williams | 1997-10-28 |
| 5643978 | Cement admixture product having improved rheological properties and process of forming same | David C. Darwin, Ellis Gartner, Byong-Wa Chun, Hideo Koyata | 1997-07-01 |
| 5633298 | Cement admixture product having improved rheological properties and process of forming same | Ahmad Arfaei, David C. Darwin, Ellis Gartner, Byong-Wa Chun, Hideo Koyata | 1997-05-27 |
| 5629385 | Allylamine copolymers having phosphonic, carboxylic or sulfonic groups and N-oxide derivatives thereof | — | 1997-05-13 |