Active single mode optical fibres and method for their fabrication
CA 2221060 C · Owner: Cselt - Centro Studi E Laboratori Telecommunicazioni S.P.A. · Inventors: Braglia, Marco
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An active single mode optical fiber has the core made of a rare earth doped non-oxide, glass and the cladding made of an oxide glass. The glass of the core has a melting, temperature lower than that of the glass of the cladding and lying within the range of, the softening temperatures of the latter. In a preferred embodiment the pore is made of, a chalcogenide glass and the cladding is made of a lead silicate glass. To produce the, fibre, a preform , obtained by introducing an element made of the non-oxide glass, into the hole of a capillary tube made of the oxide glass is brought to a, temperature lying within the range of softening temperatures of the oxide glass and not, lower …
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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 November 14, 1997 and granted March 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 14, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 2019.
- 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.