Granted Patent
Utility
US 4,585,543 · App. 06/587,905
Method for recovering hydrocarbons from solids
Inventors:
Dennis A. Duncan, Herman Woebeke
Patented Case
View Patent ↗
Granted: Apr 29, 1986
Filed: Mar 9, 1984
Inventors
Dennis A. Duncan
Herman Woebeke
Assignee (at issue)
Stone & Webster Engineering Corp.
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.