Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5393340 | Metakaolin pigment with high brightness and low abrasion and manufacture thereof from soft kaolin clays | Richard A. Slepetys | 1995-02-28 |
| 5011534 | Calcined kaolin clay filler pigment for enhancing opacity and printing properties of newsprint and mechanical papers | Richard Berube, John S. Babiec, Jr., Andrew R. Negele, Mitchell J. Willis | 1991-04-30 |
| 4213853 | Froth flotation | — | 1980-07-22 |