Issued Patents All Time
Showing 1–25 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6833479 | Antimisting agents | Mark Witschger, Jianhua Mao, Michael J. Virnig, Marie-Esther Saint Victor | 2004-12-21 |
| 6702872 | Processes for the recovery of copper from aqueous solutions containing nitrate ions | Michael J. Virnig, Hans C. Hein | 2004-03-09 |
| 6632410 | Solvent extraction process | Sang I. Kang, Michael J. Virnig, R. Brantley Sudderth, George A. Wolfe | 2003-10-14 |
| 6596053 | Processes for the recovery of copper from aqueous solutions containing nitrate ions | Michael J. Virnig, Hans C. Hein | 2003-07-22 |
| 6586632 | Preparation of quaternary ammonium compounds | Patrick M. McCurry, Jr. | 2003-07-01 |
| 6432167 | Processes for the recovery of copper from aqueous solutions containing nitrate ions | Michael J. Virnig, Hans C. Hein | 2002-08-13 |
| 6231784 | Water insoluble composition of an aldoxime extractant and an equilibrium modifier | Michael J. Virnig, Leroy O. Krbechek, J. Murdoch MacKenzie | 2001-05-15 |
| 6107523 | Beta-diketones for the extraction of copper from aqueous ammoniacal solutions | Michael J. Virnig, Gary A. Kordosky, Sang I. Kang, Kevin Martin | 2000-08-22 |
| 5968364 | Process for the removal of toxic cyanide and heavy metal species from alkaline solutions | Michael J. Virnig, George A. Wolfe, J. Michael Sierakoski, J. Murdoch MacKenzie, Keith Weerts | 1999-10-19 |
| 5936129 | Process for making sterically-hindered .beta.-diketones | Kevin Martin, Michael J. Virnig | 1999-08-10 |
| 5654458 | Recovery of palladium | Michael D. Fabiano, Gary A. Kordosky, Michael J. Virnig, Bert Gruber, Steven M. Hoagland | 1997-08-05 |
| 5607060 | Method and apparatus for removing metal contamination from soil | William E. Fristad, Jeffrey L. Narum, Michael J. Virnig, John Fast | 1997-03-04 |
| 5575918 | Method for recovery of polymers | Michael J. Virnig, Keith Weerts | 1996-11-19 |
| 5522997 | Process for the removal of toxic cyanide and heavy metal species from alkaline solutions | Michael J. Virnig, George A. Wolfe, J. Michael Sierakoski, Murdoch Mackenzie, Keith Weerts | 1996-06-04 |
| 5466426 | Method and apparatus for removing metal contamination from soil | William E. Fristad, Jeffrey L. Narum, Michael J. Virnig, John Fast | 1995-11-14 |
| 5454917 | Apparatus and process for recovering metal from an aqueous solution | William E. Friestad, John Fast | 1995-10-03 |
| 5028259 | Recovery of precious metal | Lon-Tang Wilson Lin, Michael J. Virnig | 1991-07-02 |
| 4992200 | Recovery of precious metals | Wilson L. Lin, Michael J. Virnig | 1991-02-12 |
| 4936999 | Process for recovery of amino acids from aqueous mixtures | Ronald P. Wirth, Michael J. Virnig, Leroy O. Krbechek | 1990-06-26 |
| 4912228 | Process of extraction of amino acids from aqueous solutions thereof | Thomas Stierman | 1990-03-27 |
| 4895597 | Recovery of precious metals | Wilson L. Lin, Michael J. Virnig | 1990-01-23 |
| 4886889 | Process for recovery of an amino acid from aqueous mixtures thereof | Ronald P. Wirth, Michael J. Virnig, Leroy O. Krbechek | 1989-12-12 |
| 4886888 | Extraction of amino an acid from aqueous mixtures thereof | Francis W. Tuominen, Ronald R. Swanson, Kenneth Mackay, Bradley W. Glorvigen | 1989-12-12 |
| 4814007 | Recovery of precious metals | Wilson L. Lin, Michael J. Virnig | 1989-03-21 |
| 4698429 | Alkylated 8-hydroxyquinoline derivatives via a diels-alder cycloaddition to 5,7-diallyl or 7-allyl substituents thereon | Kent S. Kokko | 1987-10-06 |