Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6190625 | Fluidized-bed roasting of molybdenite concentrates | William A. May | 2001-02-20 |
| 5232679 | Process for production of value-added coproducts from coal and other carbonaceous materials | Paul W. Woessner | 1993-08-03 |
| 5187141 | Process for the manufacture of activated carbon from coal by mild gasification and hydrogenation | Robert L. McCormick | 1993-02-16 |
| 4775106 | Use of smelter-grade sulfuric acid as true heavy-liquid media in coal cleaning | Deepak Malhotra, Frank Smit | 1988-10-04 |
| 4732888 | Durable zinc ferrite sorbent pellets for hot coal gas desulfurization | Antonio E. Blandon, Malcolm T. Hepworth | 1988-03-22 |
| 4731114 | Recovery of precious metals from refractory low-grade ores | Gopalan Ramadorai, Marcy J. Kramer | 1988-03-15 |
| 4614543 | Mixed lixiviant for separate recovery of zinc and lead from iron-containing waste materials | Willem P. C. Duyvesteyn | 1986-09-30 |
| 4610721 | Two-stage leaching process for steel plant dusts | Willem P. C. Duyvesteyn | 1986-09-09 |
| 4572771 | Zinc recovery from steel plant dusts and other zinciferous materials | Willem P. C. Duyvesteyn | 1986-02-25 |
| 4497779 | Production of potassium hexafluotitanates using dilute hydrofluoric acid | Marcy J. Kramer, William C. Warneke, Gustavo A. Meyer | 1985-02-05 |
| 4374101 | Chemical dissolution of scale formed during pressure leaching of nickeliferous oxide and silicate ores | Guy W. Lussiez | 1983-02-15 |