Granted Patent
Utility
US 5,825,950 · App. 08/647,596
Optical isolator
Inventor:
Yihao Cheng
Patented Case
View Patent ↗
Granted: Oct 20, 1998
Filed: May 13, 1996
Inventor
Yihao Cheng
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.