Granted Patent
Utility
US 4,491,386 · App. 06/298,150
Optical fiber cable and process for production thereof
Inventors:
Yukiyasu Negishi, Yukinori Ishida, Yasunori Saito, Shigeru Tanaka
Patented Case
View Patent ↗
Granted: Jan 1, 1985
Filed: Aug 31, 1981
Inventors
Yukiyasu Negishi
Yukinori Ishida
Yasunori Saito
Shigeru Tanaka
Assignees (at issue)
Nippon Telegraph and Telephone Public Corporation
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.