Granted Patent
Utility
US 4,236,788 · App. 05/953,947
Direction-indicating surface marker strip for roadways and the like
Inventor:
Charles W. Wyckoff
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: Oct 23, 1978
Inventor
Charles W. Wyckoff
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.