Granted Patent
Utility
US 4,449,586 · App. 06/387,404
Process for the recovery of hydrocarbons from oil shale
Inventors:
Peter Urban, Russell W. Johnson, Lee Hilfman
Patented Case
View Patent ↗
Granted: May 22, 1984
Filed: Jun 11, 1982
Inventors
Peter Urban
Russell W. Johnson
Lee Hilfman
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.