Granted Patent
Utility
US 4,346,176 · App. 06/225,094
Glass for optical fiber
Inventors:
Terutoshi Kanamori, Toyotaka Manabe
Patented Case
View Patent ↗
Granted: Aug 24, 1982
Filed: Jan 14, 1981
Inventors
Terutoshi Kanamori
Toyotaka Manabe
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.