Granted Patent
Utility
US 6,428,237 · App. 09/684,111
Non-redirective gating crash cushion apparatus for movable, permanent and portable roadway barriers
Inventor:
John W. Duckett
Patented Case
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Granted: Aug 6, 2002
Filed: Oct 6, 2000
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.