Granted Patent
Utility
US 6,751,808 · App. 10/372,938
Sports helmet having impact absorbing crumple or shear zone
Inventor:
Ione G. Puchalski
Patented Case
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Granted: Jun 22, 2004
Filed: Feb 26, 2003
Inventor
Ione G. Puchalski
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.