Granted Patent
Utility
US 6,445,499 · App. 09/476,610
Optical circulators
Inventors:
Kok-Wai Chang, Kejian Guan, Yong Zhang
Patented Case
View Patent ↗
Granted: Sep 3, 2002
Filed: Dec 31, 1999
Inventors
Kok-Wai Chang
Kejian Guan
Yong Zhang
Assignee (at issue)
JDS Uniphase Corporation
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.