Granted Patent
Utility
US 4,091,469 · App. 05/755,106
Head protector for use with hard head gear
Inventor:
Jacob Davidson
Patented Case
View Patent ↗
Granted: May 30, 1978
Filed: Dec 28, 1976
Inventor
Jacob Davidson
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.