Granted Patent
Utility
US 5,228,518 · App. 07/761,210
Downhole activated process and apparatus for centralizing pipe in a wellbore
Inventors:
Dennis R. Wilson, Larry K. Moran
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: Sep 16, 1991
Inventors
Dennis R. Wilson
Larry K. Moran
Assignee (at issue)
Conoco 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.