Granted Patent
Utility
US 4,615,795 · App. 06/684,009
Integrated heavy oil pyrolysis process
Inventors:
Herman N. Woebcke, Swami Narayanan, Axel Johnson
Patented Case
View Patent ↗
Granted: Oct 7, 1986
Filed: Dec 20, 1984
Inventors
Herman N. Woebcke
Swami Narayanan
Axel Johnson
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.