Granted Patent
Utility
US 4,611,352 · App. 06/529,546
Optical transmission apparatus
Inventors:
Katsuyuki Fujito, Hiroaki Nakata, Takeshige Ichida
Patented Case
View Patent ↗
Granted: Sep 9, 1986
Filed: Sep 6, 1983
Inventors
Katsuyuki Fujito
Hiroaki Nakata
Takeshige Ichida
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, 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.