Granted Patent
Utility
US 4,337,143 · App. 06/155,257
Process for obtaining products from tar sand
Inventors:
Francis V. Hanson, Jan D. Miller, Alex G. Oblad
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: Jun 2, 1980
Inventors
Francis V. Hanson
Jan D. Miller
Alex G. Oblad
Assignee (at issue)
THE UNIVERSITY OF UTAH
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.