Granted Patent
Utility
US 5,899,274 · App. 08/717,476
Solvent-assisted method for mobilizing viscous heavy oil
Inventors:
Theodore J. W. Frauenfeld, Douglas A. Lillico
Patented Case
View Patent ↗
Granted: May 4, 1999
Filed: Sep 20, 1996
Inventors
Theodore J. W. Frauenfeld
Douglas A. Lillico
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.