Granted Patent
Utility
US 5,789,349 · App. 08/614,681
Water-based drilling fluids with high temperature fluid loss control additive
Inventor:
Arvind D. Patel
Patented Case
View Patent ↗
Granted: Aug 4, 1998
Filed: Mar 13, 1996
Inventor
Arvind D. Patel
Assignee (at issue)
M-I Drilling Fluids L.L.C.
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.