Granted Patent
Utility
US 5,173,794 · App. 07/324,184
Wavelength division multiplexing using a tunable acousto-optic filter
Inventors:
Kwok Wai Cheung, Michael M. Choy
Patented Case
View Patent ↗
Granted: Dec 22, 1992
Filed: Mar 16, 1989
Inventors
Kwok Wai Cheung
Michael M. Choy
Assignee (at issue)
Bell Communications Research, Inc.
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.