Granted Patent
Utility
US 4,622,700 · App. 06/806,512
Suction ventilated helmet
Inventor:
James G. Sundahl
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: Dec 9, 1985
Inventor
James G. Sundahl
Assignee (at issue)
Bell Helmets 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.