Granted Patent
Utility
US 4,256,476 · App. 06/036,220
Low temperature process for the recovery of ethane from thermal hydrocracking vent gases
Inventor:
Edward H. Van Baush
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: May 4, 1979
Inventor
Edward H. Van Baush
Assignee (at issue)
Hydrocarbon Research, 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.