Granted Patent
Utility
US 5,336,832 · App. 07/972,664
Recovery of HF from hydrocarbon streams
Inventor:
Alfred E. Keller
Patented Case
View Patent ↗
Granted: Aug 9, 1994
Filed: Nov 6, 1992
Inventor
Alfred E. Keller
Assignee (at issue)
Conoco Inc.
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.