Granted Patent
Utility
US 4,753,548 · App. 06/912,521
Abrasive resistant pavement marker
Inventor:
Douglas Forrer
Patented Case
View Patent ↗
Granted: Jun 28, 1988
Filed: Sep 29, 1986
Inventor
Douglas Forrer
Assignee (at issue)
PacTec, 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.