Granted Patent
Utility
US 6,374,028 · App. 09/222,866
Ridge waveguide-type optical semiconductor device and method of fabricating the same
Inventors:
Koji Yamada, Koji Nakamura
Patented Case
View Patent ↗
Granted: Apr 16, 2002
Filed: Dec 30, 1998
Inventors
Koji Yamada
Koji Nakamura
Assignee (at issue)
OKI ELECTRIC INDUSTRY CO., 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.