Granted Patent
Utility
US 5,707,939 · App. 08/531,706
Silicone oil-based drilling fluids
Inventor:
Arvind D. Patel
Patented Case
View Patent ↗
Granted: Jan 13, 1998
Filed: Sep 21, 1995
Inventor
Arvind D. Patel
Assignee (at issue)
M-I Drilling Fluids
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.