Granted Patent
Utility
US 5,891,310 · App. 08/879,573
Delayed coking cycle time reduction
Inventor:
David Nelsen
Patented Case
View Patent ↗
Granted: Apr 6, 1999
Filed: Jun 20, 1997
Inventor
David Nelsen
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.