Granted Patent
Utility
US 5,146,757 · App. 07/717,280
Helmet cooling system
Inventor:
David Bentley Dearing
Patented Case
View Patent ↗
Granted: Sep 15, 1992
Filed: Jun 18, 1991
Inventor
David Bentley Dearing
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.