Granted Patent
Utility
US 4,072,403 · App. 05/705,596
Retro-reflecting assembly
Inventor:
Ludwig Eigenmann
Patented Case
View Patent ↗
Granted: Feb 7, 1978
Filed: Jul 15, 1976
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.