Laser diodes and method for making laser diodes
CA 2079593 A1 · Owner: Bell-Northern Research Ltd. · Inventors: Kwa, Peter Tjing Hak
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A monolithically integrated structure comprises a laser diode (60), a photodetector diode (62) and a reference diode (64) which are monolithically integrated on a common substrate (10). The photodetector diode (62) is optically coupled to the laser diode (60). The reference diode (64) is substantially identical to the photodetector diode (62) and optically decoupled from the laser diode (60). When substantially equal reverse biases are applied to the photodetector diode (62) and the reference diode (64) the, reference diode (64) conducts a leakage current which can be used to substantially cancel the leakage current of the photodetector diode (62). The monolithically integrated structure …
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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 May 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 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.