Granted Patent
Utility
US 6,257,334 · App. 09/359,582
Steam-assisted gravity drainage heavy oil recovery process
Inventors:
Ted Cyr, Roy Coates, Marcel Polikar
Patented Case
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Granted: Jul 10, 2001
Filed: Jul 22, 1999
Inventors
Ted Cyr
Roy Coates
Marcel Polikar
Assignee (at issue)
Alberta Oil Sands Tech and Research Authority
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.