Granted Patent
Utility
US 6,790,811 · App. 09/770,848
Oil based drilling fluid
Inventor:
Arvind D. Patel
Patented Case
View Patent ↗
Granted: Sep 14, 2004
Filed: Jan 26, 2001
Inventor
Arvind D. Patel
Assignee (at issue)
M. I. Co., Ltd.
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.