Granted Patent
Utility
US 6,555,726 · App. 09/448,651
Methods for enhanced extractive distillation employing extractive distillation compositions comprising sulfolane and compatibility agent
Inventors:
Artie S. McKim, George Kvakovszky, Michael D. Donahue
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: Nov 10, 1999
Inventors
Artie S. McKim
George Kvakovszky
Michael D. Donahue
Assignee (at issue)
Gaylord Chemical Company LLC
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.