Granted Patent
Utility
US 4,721,389 · App. 06/724,774
Method and apparatus for measuring retroreflectivity of a reflective layer on a surface
Inventor:
Robert Dejaiffe
Patented Case
View Patent ↗
Granted: Jan 26, 1988
Filed: Apr 18, 1985
Inventor
Robert Dejaiffe
Assignee (at issue)
Potters Industries, LLC
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.