Granted Patent
Utility
US 4,293,346 · App. 06/091,303
Simulated countercurrent sorption process employing ion exchange resins with backflushing
Inventors:
Arthur M. Landis, Donald B. Broughton, R. Gene Fickel
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Nov 5, 1979
Inventors
Arthur M. Landis
Donald B. Broughton
R. Gene Fickel
Assignee (at issue)
UOP 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.