Granted Patent
Utility
US 4,765,537 · App. 06/477,429
Radiator vent valve
Inventor:
John Donovan
Patented Case
View Patent ↗
Granted: Aug 23, 1988
Filed: Mar 21, 1983
Inventor
John Donovan
Assignee (at issue)
ITT 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.