Granted Patent
Utility
US 6,222,867 · App. 09/080,516
Optical semiconductor device having waveguide layers buried in an InP current blocking layer
Inventors:
Yasumasa Inomoto, Yasutaka Sakata
Patented Case
View Patent ↗
Granted: Apr 24, 2001
Filed: May 18, 1998
Inventors
Yasumasa Inomoto
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.