Granted Patent
Utility
US 6,481,920 · App. 09/561,477
Highway crash cushion
Inventors:
Patrick A. Leonhardt, Lincoln C. Cobb, John V. Machado
Patented Case
View Patent ↗
Granted: Nov 19, 2002
Filed: Apr 28, 2000
Inventors
Patrick A. Leonhardt
Lincoln C. Cobb
John V. Machado
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.