Granted Patent
Utility
US 4,328,290 · App. 06/221,158
Battery vent plug
Inventors:
Joseph Szymborski, Frank D. Unetic
Patented Case
View Patent ↗
Granted: May 4, 1982
Filed: Dec 29, 1980
Inventors
Joseph Szymborski
Frank D. Unetic
Assignee (at issue)
Gould Inc.
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.