Granted Patent
Utility
US 5,548,431 · App. 08/335,454
Bidirectional multi-channel optical ring network using WDM techniques
Inventors:
Jong-Dug Shin, Cheul-Shin Kang, El-Hang Lee
Patented Case
View Patent ↗
Granted: Aug 20, 1996
Filed: Nov 7, 1994
Inventors
Jong-Dug Shin
Cheul-Shin Kang
El-Hang Lee
Assignee (at issue)
ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
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.