Granted Patent
Utility
US 6,548,880 · App. 09/635,473
Optical semiconductor device and a method of manufacturing the same
Inventor:
Koki Hirasawa
Patented Case
View Patent ↗
Granted: Apr 15, 2003
Filed: Aug 11, 2000
Inventor
Koki Hirasawa
Assignee (at issue)
NEC Compound Semiconductor Devices, Ltd.
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.