Granted Patent
Utility
US 4,923,270 · App. 07/269,913
Apparatus for optical wavelength division multiplexing
Inventor:
Andrew Cannon Carter
Patented Case
View Patent ↗
Granted: May 8, 1990
Filed: Nov 9, 1988
Inventor
Andrew Cannon Carter
Assignee (at issue)
Plessey Overseas Limited
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.