Granted Patent
Utility
US 4,256,683 · App. 05/972,480
Heat treatment of windshield wiper blades
Inventor:
Raymond P. Porter
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Dec 22, 1978
Inventor
Raymond P. Porter
Assignee (at issue)
Acushnet Company
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.