Granted Patent
Utility
US 6,587,609 · App. 09/996,166
Optical switching device and wavelength multiplexing device having planar waveguide-type structure
Inventors:
Myung Hyun Lee, Jung Jin Ju, Jung Do, Seung Koo Park, Sun Tak Park
Patented Case
View Patent ↗
Granted: Jul 1, 2003
Filed: Nov 27, 2001
Inventors
Myung Hyun Lee
Jung Jin Ju
Jung Do
Seung Koo Park
Sun Tak Park
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.