Granted Patent
Utility
US 4,491,565 · App. 06/459,558
Countercurrent liquid-liquid contacting apparatus
Inventor:
Thomas A. Verachtert
Patented Case
View Patent ↗
Granted: Jan 1, 1985
Filed: Jan 20, 1983
Inventor
Thomas A. Verachtert
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.