Granted Patent
Utility
US 5,248,129 · App. 07/928,980
Energy absorbing roadside crash barrier
Inventor:
David C. Gertz
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Aug 12, 1992
Inventor
David C. Gertz
Assignee (at issue)
ENERGY ABSORPTION SYSTEMS, 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.