Granted Patent
Utility
US 4,317,868 · App. 06/188,976
Battery vent plug with flame arrestor
Inventor:
Bernard N. Spiegelberg
Patented Case
View Patent ↗
Granted: Mar 2, 1982
Filed: Sep 19, 1980
Inventor
Bernard N. Spiegelberg
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.