Granted Patent
Utility
US 6,554,580 · App. 09/922,023
Plunger for well casings and other tubulars
Inventors:
Windel O. Mayfield, Robert L. Moore
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: Aug 3, 2001
Inventors
Windel O. Mayfield
Robert L. Moore
Assignee (at issue)
PAAL, L.L.C.
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.