A portable lighting product, a portable lighting product circuit and a functioning method for a portable lighting product circuit
CA 2270200 A1 · Owner: Dalton, David Richard · Inventors: Dalton, David Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a circuit for a portable lighting product such as flashlight, lantern, desk lamp area light, combination area light and flashlight, front and rear bicycle light emergency light, night light, rechargeable versions of any of those products previously mentioned in which , several power sources are provided. The invention includes the feature that each power source is electrically isolated from each other by the switch in mechanism or mechanisms, when the portable lighting product is switched to the off condition. The power sources can include single dry cells or sets of , series connected dry cells of any number.
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 November 4, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 2019.
- 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.