Granted Patent
Utility
US 5,206,880 · App. 07/699,160
Furnace having tubes for cracking hydrocarbons
Inventor:
Jan-Olof Olsson
Patented Case
View Patent ↗
Granted: Apr 27, 1993
Filed: May 13, 1991
Inventor
Jan-Olof Olsson
Assignee (at issue)
KANTHAL AB
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.