Granted Patent
Utility
US 6,587,237 · App. 09/549,135
Metropolitan area network using low insertion loss optical add-drop multiplexers
Inventors:
Chao Shi, Li-Ping Chen
Patented Case
View Patent ↗
Granted: Jul 1, 2003
Filed: Apr 13, 2000
Inventors
Chao Shi
Li-Ping Chen
Assignee (at issue)
SPRINT COMMUNICATIONS COMPANY, L.P.
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.