Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5656699 | Oligoamide-epichlorohydrin resins as drainage aids | Herbert H. Espy | 1997-08-12 |
| 5633300 | Enhancement of paper dry strength by anionic and cationic guar combination | — | 1997-05-27 |