Granted Patent
Utility
US 4,416,510 · App. 06/235,141
Retroreflective structure and method of manufacturing the same
Inventor:
Ludwig Eigenmann
Patented Case
View Patent ↗
Granted: Nov 22, 1983
Filed: Feb 17, 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.