Granted Patent
Utility
US 6,312,652 · App. 08/934,334
Ceramic dip pipe and tube reactor for ethylene production
Inventor:
Dennis A. Duncan
Patented Case
View Patent ↗
Granted: Nov 6, 2001
Filed: Sep 19, 1997
Inventor
Dennis A. Duncan
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.