Bipolar wide dynamic range photodetector system
CA 1208705 A · Owner: 597589 Ontario Inc. · Inventors: Bakker, Gregory W.; Roulston, David J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bipolar wide dynamic range photodetector system includes a bipolar transistor that is biased to operate in its active region and that has a high output resistance. A reverse (or zero) biased photodiode is connected in circuit with the collector electrode of the transistor and receives light of varying intensity from a light source. A negative feedback bias network including a transistor having a very high current gain is connected between the collector and base electrodes of the first-mentioned transistor to maintain the first-mentioned transistor operating in its normal active region. As a result, the base-emitter voltage of the first-mentioned transistor is a logarithmic function of …
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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
- Granted July 29, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 29, 2003.
- 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.