Semiconductor device
CA 2182591 C · Owner: Robertson, Michael James · Inventors: Lealman, Ian Francis; Robertson, Michael James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A semiconductor optical device, for example a laser has a composite optical waveguide comprising a tapered MQW active waveguide, (1), in optical contact with a substantially planar passive waveguide (2). The fundamental optical mode supported by the composite waveguide varies along the length of the composite waveguide so that in a laser, the laser mode is enlarged and is a better match to single mode optical fibre. A method for making such semiconductor optical devices is also disclosed.
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 February 24, 1995 and granted October 3, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 24, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 2017.
- 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.