Granted Patent
Utility
US 4,369,001 · App. 06/260,289
Method for forming highly retro-reflecting roadway surface marking
Inventor:
Ludwig Eigenmann
Patented Case
View Patent ↗
Granted: Jan 18, 1983
Filed: May 4, 1981
Inventor
Ludwig Eigenmann
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.