Issued Patents 1989
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886550 | Flexible grout composition and method | — | 1989-12-12 |
| 4847226 | Process for extruding and acid treating clay for improved filtration | — | 1989-07-11 |
| 4836940 | Composition and method of controlling lost circulation from wellbores | — | 1989-06-06 |
| 4832793 | Process for extruding and acid treating clay for improved color development in carbonless copy paper | — | 1989-05-23 |
| 4824901 | Surface treated absorbent polymers | Mark Anderson, Barbara R. Regan | 1989-04-25 |
| 4820742 | Method for continuous manufacture of solid water absorbing resin | Maynard Teppo | 1989-04-11 |
| 4820773 | Water absorbent resins prepared by polymerization in the presence of styrene-maleic anhydride copolymers | Mark Anderson, Barbara R. Regan | 1989-04-11 |