Granted Patent
Utility
US 6,770,601 · App. 09/246,932
Aphron-containing aqueous well drilling and servicing fluids
Inventor:
Tommy F. Brookey
Patented Case
View Patent ↗
Granted: Aug 3, 2004
Filed: Feb 9, 1999
Inventor
Tommy F. Brookey
Assignee (at issue)
MASI Technologies, 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.