Granted Patent
Utility
US 4,480,897 · App. 06/388,543
Single-polarization single-mode optical fiber
Inventors:
Katsunari Okamoto, Toshihito Hosaka, Yutaka Sasaki, Juichi Noda, Takao Edahiro
Patented Case
View Patent ↗
Granted: Nov 6, 1984
Filed: Jun 15, 1982
Inventors
Katsunari Okamoto
Toshihito Hosaka
Yutaka Sasaki
Juichi Noda
Takao Edahiro
Assignee (at issue)
Nippon Telegraph and Telephone Public Corporation
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.