Granted Patent
Utility
US 4,319,929 · App. 06/095,767
Simulated countercurrent sorption process employing ion exchange resins with periodic backflushing
Inventor:
R. Gene Fickel
Patented Case
View Patent ↗
Granted: Mar 16, 1982
Filed: Nov 19, 1979
Inventor
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.