Long period optical fiber grating filter device
CA 2288349 C · Owner: Jang, Joo-Nyung · Inventors: Jang, Joo-Nyung; Kim, Se-Yoon; Kim, Min-Sung
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a long period optical fiber grating filter device. The long period optical fiber grating filter device includes a core having long period, optical fiber gratings formed therein at every predetermined periods a , cladding, surrounding the core, a coating covering a cladding portion free from the long period optical fiber gratings, a recoating covering a cladding portion having the, long period optical fiber gratings a core/cladding refractive index changing portion where a coupling wavelength has a negative wavelength shift range with respect to a temperature change according to the amount of a dopant added to the, core, and a cladding/recoating refractive index changing …
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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 2, 1999 and granted June 25, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 2, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 2, 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
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.