Granted Patent
Utility
US 4,815,889 · App. 07/219,319
Lane barrier system with pivot control and method
Inventor:
John W. Duckett
Patented Case
View Patent ↗
Granted: Mar 28, 1989
Filed: Jul 15, 1988
Inventor
John W. Duckett
Assignee (at issue)
Barrier 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.