Granted Patent
Utility
US 6,111,998 · App. 08/919,306
Semiconductor optical device, fiber optical amplifier and optical transmission system
Inventors:
Tatemi Ido, Hirohisa Sano, Hiroyuki Gomyo
Patented Case
View Patent ↗
Granted: Aug 29, 2000
Filed: Aug 28, 1997
Inventors
Tatemi Ido
Hirohisa Sano
Hiroyuki Gomyo
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.