Granted Patent
Utility
US 6,571,868 · App. 09/944,473
Well head lubricator assembly with polyurethane impact-absorbing spring
Inventor:
Bruce M. Victor
Patented Case
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Granted: Jun 3, 2003
Filed: Aug 30, 2001
Inventor
Bruce M. Victor
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.