Granted Patent
Utility
US 5,678,935 · App. 08/625,005
Semiconductor optical waveguide and method of fabricating the same
Inventor:
Yasutaka Sakata
Patented Case
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Granted: Oct 21, 1997
Filed: Mar 29, 1996
Inventor
Yasutaka Sakata
Assignee (at issue)
NEC 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.