Granted Patent
Utility
US 6,156,708 · App. 09/246,935
Aphron-containing oil base fluids and method of drilling a well therewith
Inventors:
Tommy F. Brookey, Jack C. Cowan
Patented Case
View Patent ↗
Granted: Dec 5, 2000
Filed: Feb 9, 1999
Inventors
Tommy F. Brookey
Jack C. Cowan
Assignee (at issue)
Actisystems, Inc.
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.