Optical fiber
CA 2354004 A1 · Owner: Hagihara, Shinjiro · Inventors: Hada, Mitsuomi; Hagihara, Shinjiro; Watanabe, Morio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an optical fiber having a large positive dispersion in a wavelength band of 1.55 µm in order to compensate for a negative dispersion inherent in an NZ-DSF in the wavelength band of 1.55 µm. This optical fiber comprises a depressed cladding structure constituted by a core region; an inner cladding, disposed at the outer periphery of the core region, having a lower refractive index; and an outer cladding having a higher refractive index. In this optical fiber the relative refractive index , difference of the core region with respect to the outer cladding is at least 0.30 % but not greater than 0.50 %, and the relative refractive index difference of the …
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 December 16, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 16, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 16, 2021.
- 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.