Granted Patent
Utility
US 5,117,469 · App. 07/649,659
Polarization-dependent and polarization-diversified opto-electronic devices using a strained quantum well
Inventors:
Kwok Wai Cheung, Chung-En Zah
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Feb 1, 1991
Inventors
Kwok Wai Cheung
Chung-En Zah
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.