Granted Patent
Utility
US 4,681,302 · App. 06/703,662
Energy absorbing barrier
Inventor:
Marion L. Thompson
Patented Case
View Patent ↗
Granted: Jul 21, 1987
Filed: Feb 21, 1985
Inventor
Marion L. Thompson
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.