Granted Patent
Utility
US 5,242,020 · App. 07/628,690
Method for deploying extendable arm for formation evaluation MWD tool
Inventor:
Martin E. Cobern
Patented Case
View Patent ↗
Granted: Sep 7, 1993
Filed: Dec 17, 1990
Inventor
Martin E. Cobern
Assignee (at issue)
Baker Hughes Holdings LLC
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.