Granted Patent
Utility
US 6,399,404 · App. 09/407,091
Fabricating method of optical semiconductor device
Inventor:
Yasutaka Sakata
Patented Case
View Patent ↗
Granted: Jun 4, 2002
Filed: Sep 28, 1999
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.