Granted Patent
Utility
US 6,187,147 · App. 09/079,889
Delayed coker unit furnace
Inventor:
Brian Doerksen
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: May 15, 1998
Inventor
Brian Doerksen
Assignee (at issue)
Conoco Inc.
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.