Granted Patent
Utility
US 4,428,320 · App. 06/271,416
Reflective paving marker
Inventors:
David W. Oplt, Fred G. Peil
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Jun 8, 1981
Inventors
David W. Oplt
Fred G. Peil
Assignee (at issue)
Lukens General Industries, 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.