Circuit and method of operation for an electrical power supply
CA 2562214 A1 · Owner: Blackberry Limited · Inventors: Guthrie, Martin G. A.; Veselic, Dusan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A battery charging circuit comprising: a semiconductor switch having an output connected to a rechargeable battery; a battery charge controller for receiving power, from an external source, and supplying output power to a portable device and the, input of the semiconductor switch the current output of the battery charge controller, being controllable; and a voltage sensing circuit for: measuring the voltage drop, across the battery charge controller; and responding to the voltage drop across the, battery charge controller by modulating the semiconductor switch to reduce the quantity of current supplied to the rechargeable battery when the voltage drop is too, great; whereby the total …
Read the whole patent
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 February 21, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 21, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 21, 2025.
- 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.