Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5244155 | Solid-solid separations utilizing alkanol amines | Richard R. Klimpel, Donald E. Leonard | 1993-09-14 |
| 5169518 | Recovery of petroleum from tar sands | Richard R. Klimpel | 1992-12-08 |
| 5131600 | Alkanol amine grinding aids | Richard R. Klimpel, Donald E. Leonard | 1992-07-21 |
| 5057209 | Depression of the flotation of silica or siliceous gangue in mineral flotation | Richard R. Klimpel, Donald E. Leonard, Robert D. Hansen | 1991-10-15 |
| 4387028 | Use of quaternized polyalkylene polyamines as demulsifiers | — | 1983-06-07 |