Granted Patent
Utility
US 4,005,503 · App. 05/617,013
Windshield wiper blade refill
Inventor:
John T. Petrik
Patented Case
View Patent ↗
Granted: Feb 1, 1977
Filed: Sep 26, 1975
Inventor
John T. Petrik
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.