Low-dispersion optical fiber and optical transmission system using the low-dispersion optical fiber
CA 2368327 A1 · Owner: Sugizaki, Ryuichi · Inventors: Arai, Shinichi; Inoue, Katsunori; Terada, Jun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lower-dispersion optical fiber achieving both low wavelength dispersion in the usable wavelength region and enlarged effective core cross-section. The outer peripheral face of a center core (1) of the lower dispersion optical fiber is covered with a first side core (2) the outer peripheral face of the first side core (2) is covered with a second side core (3) and the outer , peripheral face of the second side core (3) is covered with a clad (5). If the maximum refractive index of the center core (1) is n1 the minimum refractive , index of the first side core (2) is n2 the maximum refractive index of the , second side core (3) is n3 and the refractive index of the clad (5) is nc a , …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed February 23, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 23, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 23, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.