Granted Patent
Utility
US 4,238,320 · App. 06/031,630
Denitrogenation of shale oil
Inventors:
Donald C. Cronauer, Roger F. Vogel, Richard A. Flinn
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Apr 19, 1979
Inventors
Donald C. Cronauer
Roger F. Vogel
Richard A. Flinn
Assignee (at issue)
Gulf Research & Development 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.