Granted Patent
Utility
US 5,211,503 · App. 07/690,515
Barrier gate for longitudinal highway barrier
Inventor:
John P. Quittner
Patented Case
View Patent ↗
Granted: May 18, 1993
Filed: Apr 24, 1991
Inventor
John P. Quittner
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.