Front surface emitting diode laser
CA 2034987 C · Owner: Kwon, Young-Se · Inventors: Yoo, Hoi-Jun; Kwon, Young-Se
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A front-surface emitting, vertical cavity laser and its method of making in which a vertical laser cavity with Bragg reflectors(36,50,52) and an active layer(18) preferably, formed by a quantum well, is formed on a substrate(48). Lateral current confinement is achieved by implanting a conductivity-reducing ion into the region(28) surrounding the quantum well. Electrical contact(44) to the upper side of the active layer is achieved by implanting a conductivity-increasing ion into the region(32) surrounding the cavity between the active layer(18) and the upper reflector(36). By such an electrical contact the upper reflector(36) can advantageously be composed of dielectric layers(38,40). Light …
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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 January 25, 1991 and granted April 26, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 25, 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
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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.