Granted Patent
Utility
US 6,725,939 · App. 10/174,106
Expandable centralizer for downhole tubulars
Inventor:
Bennett M. Richard
Patented Case
View Patent ↗
Granted: Apr 27, 2004
Filed: Jun 18, 2002
Inventor
Bennett M. Richard
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.