Granted Patent
Utility
US 6,567,581 · App. 09/881,274
Fiber optic dense wavelength division multiplexer utilizing a multi-stage parallel cascade method of wavelength separation
Inventor:
Simon Cao
Patented Case
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Granted: May 20, 2003
Filed: Jun 14, 2001
Inventor
Simon Cao
Assignee (at issue)
Avanex 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.