Granted Patent
Utility
US 6,498,676 · App. 09/309,489
Optical filter for use or with an optical amplifier
Inventors:
Donald R. Zimmerman, Yihao Cheng
Patented Case
View Patent ↗
Granted: Dec 24, 2002
Filed: May 11, 1999
Inventors
Donald R. Zimmerman
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.