Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5540337 | Alkyloxyalkaneamines useful as cationic froth flotation collectors | William F. Riggs | 1996-07-30 |
| 4425230 | Separation of molybdenite from its mixture with other sulfide ores | William F. Riggs | 1984-01-10 |