Granted Patent
Utility
US 4,586,943 · App. 06/661,451
Method for the production of glass preform for optical fibers
Inventors:
Michihisa Kyoto, Naoki Yoshioka, Gotaro Tanaka, Minoru Watanabe, Hiroshi Shimba, Nobuo Inagaki
Patented Case
View Patent ↗
Granted: May 6, 1986
Filed: Oct 16, 1984
Inventors
Michihisa Kyoto
Naoki Yoshioka
Gotaro Tanaka
Minoru Watanabe
Hiroshi Shimba
Nobuo Inagaki
Assignees (at issue)
SUMITOMO ELECTRIC INDUSTRIES, LTD.
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.