Method and device for removing lead sulfate film formed in lead-acid battery
CA 2500007 A1 · Owner: Eruma Co. Ltd. · Inventors: Okuno, Shigeo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel device for removing a lead sulfate film formed on an electrode by decomposing the film into a particulate state without causing the film to come off or float, thereby recovering the performance of the lead-acid battery and prolonging the life. The electrodes of the battery are not damaged and noise is not produced externally. The device is attached to a lead-acid battery to remove the lead sulfate film formed by sulfation on an electrode of the battery. The device comprises a voltage sensor a reference voltage generator, a voltage comparator an operation/nonoperation switch, an oscillator an , amplifier, a waveform shaping circuit a negative pulse current generator, and …
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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 September 17, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 17, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 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.