Granted Patent
Utility
US 6,269,891 · App. 09/392,520
Through-drill string conveyed logging system
Inventor:
Douwe Johannes Runia
Patented Case
View Patent ↗
Granted: Aug 7, 2001
Filed: Sep 9, 1999
Inventor
Douwe Johannes Runia
Assignee (at issue)
SHELL OIL COMPANY
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.