Granted Patent
Utility
US 4,681,480 · App. 06/888,314
Method for forming roadway-marking means whereby individual retroreflecting elements are gathered and grouped together
Inventor:
Ludwig Eigenmann
Patented Case
View Patent ↗
Granted: Jul 21, 1987
Filed: Jul 22, 1986
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.