Granted Patent
Utility
US 6,090,754 · App. 08/987,726
Surfactant blends for well operation
Inventors:
Albert F. Chan, Kieu T. Ly
Patented Case
View Patent ↗
Granted: Jul 18, 2000
Filed: Dec 9, 1997
Inventors
Albert F. Chan
Kieu T. Ly
Assignee (at issue)
Atlantic Richfield 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.