Granted Patent
Utility
US 4,892,564 · App. 07/172,670
Membrane process for hydrocarbon liquid recovery
Inventor:
Thomas E. Cooley
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Mar 24, 1988
Inventor
Thomas E. Cooley
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.