Granted Patent
Utility
US 5,257,875 · App. 07/922,628
One-way snowplowable pavement marker
Inventor:
Robert M. Flanagan
Patented Case
View Patent ↗
Granted: Nov 2, 1993
Filed: Jul 30, 1992
Inventor
Robert M. Flanagan
Assignee (at issue)
Stimsonite Corporation
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.