Granted Patent
Utility
US 5,351,341 · App. 07/934,200
Multiple density helmet body compositions to strengthen helmet
Inventor:
Lester Broersma
Patented Case
View Patent ↗
Granted: Oct 4, 1994
Filed: Aug 24, 1992
Inventor
Lester Broersma
Assignee (at issue)
Bell Sports, 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.