Granted Patent
Utility
US 6,674,878 · App. 09/918,375
System for automated determination of retroreflectivity of road signs and other reflective objects
Inventors:
James E. Retterath, Robert A. Laumeyer
Patented Case
View Patent ↗
Granted: Jan 6, 2004
Filed: Jul 30, 2001
Inventors
James E. Retterath
Robert A. Laumeyer
Assignee (at issue)
Facet Technology Corp.
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.