Granted Patent
Utility
US 6,569,983 · App. 10/034,276
Method and composition for recovering hydrocarbon fluids from a subterranean reservoir
Inventors:
Duane S. Treybig, Kin-Tai Chang, Dennis A. Williams
Patented Case
View Patent ↗
Granted: May 27, 2003
Filed: Dec 20, 2001
Inventors
Duane S. Treybig
Kin-Tai Chang
Dennis A. Williams
Assignee (at issue)
Ondeo Nalco Energy Services, L.P.
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.