Granted Patent
Utility
US 4,685,824 · App. 06/763,421
Road marking provided with protruding elements capable of resisting to snow plowing implements
Inventor:
Ludwig Eigenmann
Patented Case
View Patent ↗
Granted: Aug 11, 1987
Filed: Aug 7, 1985
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.