Granted Patent
Utility
US 4,244,045 · App. 06/008,161
Optical multiplexer and demultiplexer
Inventors:
Kiyoshi Nosu, Hideki Ishio, Tetsuya Miki
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Jan 31, 1979
Inventors
Kiyoshi Nosu
Hideki Ishio
Tetsuya Miki
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.