Granted Patent
Utility
US 4,297,206 · App. 06/117,591
Solvent extraction of synfuel liquids
Inventor:
Edward G. Scheibel
Patented Case
View Patent ↗
Granted: Oct 27, 1981
Filed: Feb 1, 1980
Inventor
Edward G. Scheibel
Assignee (at issue)
SUNTEC CO., LTD.
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.