Granted Patent
Utility
US 5,790,301 · App. 08/805,559
Optical filter module and optical amplification using it
Inventors:
Hidenari Maeda, Takashi Watanabe, Toshio Nakamura, Manabu Wakabayashi
Patented Case
View Patent ↗
Granted: Aug 4, 1998
Filed: Feb 25, 1997
Inventors
Hidenari Maeda
Takashi Watanabe
Toshio Nakamura
Manabu Wakabayashi
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.