Granted Patent
Utility
US 4,549,541 · App. 06/536,282
Helmet system
Inventor:
James G. Sundahl
Patented Case
View Patent ↗
Granted: Oct 29, 1985
Filed: Sep 28, 1983
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.