Granted Patent
Utility
US 5,035,009 · App. 07/589,387
Protective helmet and liner
Inventors:
James C. Wingo, Nelson Kraemer
Patented Case
View Patent ↗
Granted: Jul 30, 1991
Filed: Sep 27, 1990
Inventors
James C. Wingo
Nelson Kraemer
Assignee (at issue)
Riddell, 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.