Granted Patent
Utility
US 6,240,571 · App. 09/435,937
Protective helmet with adjustable sizes
Inventor:
Ralph Infusino
Patented Case
View Patent ↗
Granted: Jun 5, 2001
Filed: Nov 9, 1999
Inventor
Ralph Infusino
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.