Granted Patent
Utility
US 6,290,494 · App. 09/680,187
Method and apparatus for coal coking
Inventor:
Michael P. Barkdoll
Patented Case
View Patent ↗
Granted: Sep 18, 2001
Filed: Oct 5, 2000
Inventor
Michael P. Barkdoll
Assignee (at issue)
Sun Coke Company
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.