Multicolour voltage tunable quantum well intersubband infrared photodetector and associated method
CA 2127596 C · Owner: Liu, Hui Chun · Inventors: Liu, Hui Chun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A quantum well intersubband infrared (IR) photodetector has a spectral response, tunable by an external voltage. The photodetector consists of multiple doped quantum, wells with different well widths and barrier heights. The preferred embodiment is made, by repeating the whole structure of the active region of a multiple quantum well, intersubband IR photodetector. Differences between repeats or groups of well widths, and barrier heights result in differences in the spectral IR response of the different, repeats. The device resistance of a given group is designed to be very different from, those for all the other groups. As a function of an applied voltage the , repeat with the, …
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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 July 7, 1994 and granted December 2, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 7, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 7, 2016.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.