Granted Patent
Utility
US 4,828,425 · App. 07/219,320
Pre-loaded hinges for lane barrier system
Inventor:
John W. Duckett
Patented Case
View Patent ↗
Granted: May 9, 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.