Distribution management optical fiber, its manufacturing method, optical communication system employing the optical fiber and optical fiber base material
CA 2385935 A1 · Owner: Ishikawa, Shinji · Inventors: Nishimura, Masayuki; Tanaka, Shigeru; Sasaoka, Eisuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A distribution management optical fiber which can be manufactured easily and connected to another optical fiber easily etc. The distribution management , optical fiber is a quartz optical fiber which has a secured single mode at a predetermined wavelength within a signal wave band and is composed of 1st , parts with positive wavelength distributions and 2nd parts with negative wavelength distributions which are alternately arranged adjacent to each other. The distribution management glass fiber has a uniform additive concentration in a longitudinal direction and on the other hand, the , refractive indices or residual stresses of glass layers to which GeO2 is not added as an additive …
Read the whole patent
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 September 20, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 20, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 2022.
- 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
Timeline From CIPO dates
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.