Optical demultiplexing/multiplexing device having a wavelength dependent element
CA 2246570 C · Owner: Lundgren, Kent R. · Inventors: Colbourne, Paul; Lundgren, Kent R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device capable of demultiplexing or multiplexing optical signals includes a wavelength dependent element for separating an input beam into sub-beams of light in accordance with their wavelength. Precisely spaced optical fibres are disposed to receive at least some of the sub-beams of light; a focusing lens is disposed between the wavelength dependent element and the optical fibres for focusing the sub-beams at ends of the optical fibres. A rod-like GRIN lens for correcting for an offset in the focal length of the focusing lens is placed between the focusing lens and the optical fibres. The GRIN lens can be polished to change its length in order to correct for the offset in focal length of …
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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 September 3, 1998 and granted January 22, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 3, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 2020.
- 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.