Granted Patent
Utility
US 6,123,159 · App. 09/121,713
Aphron-containing well drilling and servicing fluids of enhanced stability
Inventors:
Tommy F. Brookey, Roy F. House
Patented Case
View Patent ↗
Granted: Sep 26, 2000
Filed: Jul 24, 1998
Inventors
Tommy F. Brookey
Roy F. House
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.