Granted Patent
Utility
US 4,948,052 · App. 07/335,849
Reversible gear oscillating sprinkler with cam controlled shift retainer
Inventor:
Edwin J. Hunter
Patented Case
View Patent ↗
Granted: Aug 14, 1990
Filed: Apr 10, 1989
Inventor
Edwin J. Hunter
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.