Granted Patent
Utility
US 5,639,715 · App. 08/217,432
Aqueous based drilling fluid additive and composition
Inventor:
Arvind D. Patel
Patented Case
View Patent ↗
Granted: Jun 17, 1997
Filed: Mar 24, 1994
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.