Voltage-tunable photodetector
CA 2108096 C · Owner: American Telephone And Telegraph Company · Inventors: Goossen, Keith Wayne
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tunable monolithic integrated photodetector (10) detects a selected wavelength of incident light within a wavelength range. The photodetector comprises a multiple quantum well (MQW) filter means for receiving and filtering the incident light, and an MQW detector means for receiving light from the MQW filter means and for detecting the selected wavelength. A fixed voltage bias V.DELTA. is disposed between the filter means and the detector means for causing the filter means to absorb light wavelengths around the selected wavelength to thereby enhance the detectability of the selected wavelength. Further, a variable voltage bias Vp is selectively and proportionally imposed on both the filter …
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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 October 8, 1993 and granted September 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 8, 2015.
- 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.