Granted Patent
Utility
US 4,923,006 · App. 07/373,093
Insulating support for tubing string
Inventors:
Michael Hartmann, Jerry D. Smith
Patented Case
View Patent ↗
Granted: May 8, 1990
Filed: Aug 7, 1989
Inventors
Michael Hartmann
Jerry D. Smith
Assignee (at issue)
Cameron Iron Works USA, 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.