Granted Patent
Utility
US 5,868,521 · App. 08/996,748
Highway crash cushion and components thereof
Inventors:
Michael H. Oberth, David C. Gertz, John V. Machado, Barry D. Stephens
Patented Case
View Patent ↗
Granted: Feb 9, 1999
Filed: Dec 23, 1997
Inventors
Michael H. Oberth
David C. Gertz
John V. Machado
Barry D. Stephens
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.