Granted Patent
Utility
US 6,229,832 · App. 09/188,364
Optical wavelength stability control apparatus, optical transmitter and multiple wavelength transmitter
Inventors:
Naohiko Baba, Hideyuki Serizawa, Akihiro Hayami, Tadashi Hatano, Yasuhiro Yamada, Norio Chujo
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Nov 10, 1998
Inventors
Naohiko Baba
Hideyuki Serizawa
Akihiro Hayami
Tadashi Hatano
Yasuhiro Yamada
Norio Chujo
Assignee (at issue)
HITACHI, 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.