Granted Patent
Utility
US 5,471,340 · App. 08/178,838
Reflective optical non-reciprocal devices
Inventors:
Yihao Cheng, Gary S. Duck
Patented Case
View Patent ↗
Granted: Nov 28, 1995
Filed: Jan 7, 1994
Inventors
Yihao Cheng
Gary S. Duck
Assignee (at issue)
JDS Fitel 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.