Branched optical waveguide, and its method of use
CA 2331069 A1 · Owner: Dawnay, Emma Jane Clarissa · Inventors: Dawnay, Emma Jane Clarissa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The device comprises an upper silicon layer (10) including two optically connected rib waveguides (3, 4) formed in the upper silicon layer (10); a pair of dissimilar materials (6, 7) each positioned between the two waveguides (3 4); and an electrical circuit (8, 9, 13) through the pair of dissimilar materials (6, 7), so that an electrical current can be passed through the dissimilar materials (6, 7) in both forward and reverse directions so as to , simultaneously heat one waveguide and cool the other waveguide by virtue of the Peltier effect.
Read the whole patent
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 April 26, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 26, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 26, 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
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.