Granted Patent
Utility
US 4,820,216 · App. 07/148,055
Adjustable kayak paddle
Inventor:
William E. Masters
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Jan 25, 1988
Inventor
William E. Masters
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.