Granted Patent
Utility
US 4,411,553 · App. 06/265,231
Retro-reflecting globules for road surface marking
Inventor:
Ludwig Eigenmann
Patented Case
View Patent ↗
Granted: Oct 25, 1983
Filed: May 19, 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.