Optical fiber, method of making optical fiber preform, and method of making optical fiber
CA 2355819 A1 · Owner: Kato, Takatoshi · Inventors: Nagayama, Katsuya; Kato, Takatoshi; Kawasaki, Kiichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical fiber comprising a core region 100 doped with C1 which raises the refractive index; and a cladding region 200, provided at the outer periphery of the core region 100, having a cladding layer 201 doped with F which lowers the refractive index is formed. The cladding region 201 to become the outermost cladding layer is configured such that the doping amount of F successively decreases within an outer peripheral part 205 including the outer periphery thereof to a predetermined doping amount which is the minimum doping amount of F within the cladding layer 201. Therefore the, stress within the optical fiber is dispersed into the outer peripheral part 205 having an enhanced viscosity …
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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 August 27, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 27, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 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.