Granted Patent
Utility
US 5,594,821 · App. 08/442,361
Integrated optical isolator
Inventor:
Yihao Cheng
Patented Case
View Patent ↗
Granted: Jan 14, 1997
Filed: May 16, 1995
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.