Process and device for making gratings in optical fibres
CA 2329107 A1 · Owner: Tallone, Luigi · Inventors: Tallone, Luigi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
During the process of writing a grating the fibre, (F) is placed in a support (16) which has a surface cut-out such as a V-shaped groove (18). The side walls (20) of this groove (18) form an angle (a) of 60° with respect to the direction (X12) of propagation of the radiation arriving from the source (12). The aforesaid surfaces (20) have characteristics of high reflectivity with respect to the aforesaid radiation. Consequently during the writing process, the core (1A) of the fibre (F) is subjected to the action of a plurality of radiation fronts converging on the core. The first radiation front corresponds to the radiation arriving from the source (12) and two other radiation fronts (B C) …
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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 December 20, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 20, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 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.