Granted Patent
Utility
US 4,806,044 · App. 07/196,435
Anti-crash lane barrier with self-centering hinges
Inventor:
John W. Duckett
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: May 20, 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.