Apparatus for dispersion compensating a signal that propagates along a signal path
CA 2479115 C · Owner: Southampton Photonics Limited · Inventors: Zervas, Mikhail Nickolaos
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for dispersion compensating a signal (18) that propagates along a signal path (19), which apparatus comprises a grating (1) and a tuning means (2). The grating (1) is characterized by a wavelength operating range (3) and a group delay (4) that varies with wavelength (5) wherein the group delay (4) , is equal at a plurality of pairs of wavelengths (6) (7) that are separated , within the wavelength operating range (3) and wherein the grating (1) , reflects each wavelength pair (6) from the same region (8) of the grating (1) and different wavelength pairs (7) from different regions (9) of the grating (1).
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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 March 10, 2003 and granted December 4, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 10, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2025.
- 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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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.