Granted Patent
Utility
US 5,905,061 · App. 08/862,198
Invert emulsion fluids suitable for drilling
Inventor:
Avind D. Patel
Patented Case
View Patent ↗
Granted: May 18, 1999
Filed: May 23, 1997
Inventor
Avind D. Patel
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.