High efficiency light emitters with reduced polarization-induced charges
CA 2393044 C · Owner: Nitres, Inc. · Inventors: Ibbetson, James; Thibeault, Brian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Naturally occurring polarization-induced electric fields in a semiconductor light emitter with crystal layers (2-7) grown along a polar direction are reduced, canceled or reversed to improve the emitter's operating efficiency and carrier confinement. This is accomplished by reducing differences in the material compositions of adjacent crystal layers (2-7) grading one or more , layers to generate space charges and quasi-fields that oppose polarizationinduced charges, incorporating various impurities into the semiconductor that ionize into a charge state opposite to the polarization induced charges inverting the sequence of charged atomic layers inverting the growth sequence , of n- and …
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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 November 30, 2000 and granted January 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 2022.
- 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.