Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7842107 | Method and apparatus for thermally upgrading carbonaceous materials | Philippus J. Meyer, Michael F. Ray, Michael Schlegel, Sheldon Schultz | 2010-11-30 |
| 7198655 | Method and apparatus for thermally upgrading carbonaceous materials | Philippus J. Meyer, Michael F. Ray, Michael Schlegel, Sheldon Schultz | 2007-04-03 |
| 6428763 | Process for the production of iron carbide from iron oxide using external sources of carbon monoxide | Frank M. Stephens, Jr., Frank A. Stephens, John P. Hager | 2002-08-06 |
| 5733357 | Process for converting iron oxide to iron carbide employing internally generated carbon oxide as the carbiding agent | Frank M. Stephens, Jr., Frank A. Stephens | 1998-03-31 |
| 4610722 | Process for metal recovery from steel plant dust | Willem P. C. Duyvesteyn | 1986-09-09 |
| 4552629 | Electrogalvanizing utilizing primary and secondary zinc sources | Willem P. C. Duyvesteyn | 1985-11-12 |
| 4551314 | Process for improving solvent extraction operation using two mixers | Leo W. Beckstead, Linn D. Havelick | 1985-11-05 |
| 4504448 | Activated carbon adsorption of flotation reagents from tungsten solutions | Dennis E. Voelker, Leo W. Beckstead | 1985-03-12 |
| 4490339 | Process for recovering tungsten from MoS.sub.3 /WS.sub.3 precipitates | Leo W. Beckstead, Dennis E. Voelker | 1984-12-25 |
| 4443415 | Recovery of V.sub.2 O.sub.5 and nickel values from petroleum coke | Paul B. Queneau, Leo W. Beckstead, Dale K. Huggins | 1984-04-17 |
| 4342728 | Process for digesting tungsten ores containing organic matter | Paul B. Queneau, Leo W. Beckstead | 1982-08-03 |
| 4338287 | Process for conditioning tungsten concentrates | Dale K. Huggins, Leo W. Beckstead | 1982-07-06 |
| 4303623 | Separation of trace molybdenum from tungstate solutions | Dale K. Huggins, Paul B. Queneau, Robert C. Ziegler, Leo W. Beckstead | 1981-12-01 |