Granted Patent
Utility
US 4,289,406 · App. 06/018,909
Light transmission measurement method
Inventor:
William J. Maddox
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: Mar 9, 1979
Inventor
William J. Maddox
Assignee (at issue)
RCA Corporation
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.