Granted Patent
Utility
US 4,542,957 · App. 06/522,260
Plastics optical fibers
Inventors:
Kazuo Ishiwari, Akira Ohmori, Nobuyuki Tomihashi, Sumiko Yuhara, Toshikuni Kaino, Kaname Jinguji, Shigeo Nara
Patented Case
View Patent ↗
Granted: Sep 24, 1985
Filed: Aug 11, 1983
Inventors
Kazuo Ishiwari
Akira Ohmori
Nobuyuki Tomihashi
Sumiko Yuhara
Toshikuni Kaino
Kaname Jinguji
Shigeo Nara
Assignees (at issue)
Nippon Telegraph and Telephone Public Corporation
Kaikiu Kogyo 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.