Granted Patent
Utility
US 6,646,441 · App. 10/053,043
Well logging system for determining resistivity using multiple transmitter-receiver groups operating at three frequencies
Inventors:
Larry W. Thompson, MacMillian M. Wisler, Jian-Qun Wu
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Jan 19, 2002
Inventors
Larry W. Thompson
MacMillian M. Wisler
Jian-Qun Wu
Assignee (at issue)
Precision Drilling Technology Services Group, Inc.
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.