Granted Patent
Utility
US 5,202,521 · App. 07/893,630
Monoolefin/paraffin separation by selective absorption
Inventors:
Ronald E. Brown, Robert L. Hair
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Jun 5, 1992
Inventors
Ronald E. Brown
Robert L. Hair
Assignee (at issue)
Phillips Petroleum Company
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.