Optical device
CA 2096420 C · Owner: The Secretary Of State For Defence In Her Britannic Majesty'S Government Of The United Kingdom Of Great Britain And Northern Ireland · Inventors: Jenkins, Richard Michael; Heaton, John Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical device (l0) for use in beamsplitting recombination and related , applications incorporates a rectangular multimode waveguide (20) connecting a first coupling waveguide (l8) to two second coupling waveguides (22,24).The first coupling waveguide (18) operates in its fundamental mode and provides an input which excites a series of symmetric modes of the multimode waveguide (20). Modal dispersion along the multimode waveguide (20) provides for the input excitation (70a) to be transformed into separate output excitations (75a,75b) centred on respective second coupling waveguides (22,24).The radiation intensity distribution (75) goes to zero at multimode waveguide end wall regions …
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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 2, 1991 and granted May 7, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 2, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 2, 2013.
- 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.