Granted Patent
Utility
US 4,442,566 · App. 06/318,840
Windshield wiper blade refill unit
Inventor:
Bernard C. Sharp
Patented Case
View Patent ↗
Granted: Apr 17, 1984
Filed: Nov 6, 1981
Inventor
Bernard C. Sharp
Assignee (at issue)
Parker-Hannifin Corporation
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.