Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6206947 | Process for making an animal litter comprising gypsum, aluminum sulfate and urea | Donald Evans, Richard B. Steele | 2001-03-27 |
| 6029603 | Animal litter comprising gypsum and aluminum sulfate and processes of making same | Donald Evans, Richard B. Steele | 2000-02-29 |