Battery charge monitor and fuel gauge
CA 2106672 A1 · Owner: Cooper, Patrick R. · Inventors: Freiman, Joseph F.; Interiano, Armando; Hess, Randall L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A battery charge controller and fuel gauge which accurately monitors the voltage, temperature and charge and, discharge current of a rechargeable battery and calculates the, battery's charge capacity and charge level. Each time the battery is fully discharged, any calculated charge level remaining is divided by two and subtracted from the previously calculated charge capacity. When the battery is fully charged the charge level is set equal to the charge capacity. During subsequent charge and discharge, the current is converted to a coulomb count and added or subtracted from the charge level to maintain an accurate charge level. Fast charge inefficiency due to temperature is considered by …
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 January 20, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 20, 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.