Battery voltmeter
CA 2023173 C · Owner: Cataldi, Richard T. · Inventors: Hein, Patrick D.; Leo, John C.; Cataldi, Richard T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention discloses a battery voltmeter comprising:, A) a dielectric layer B) a conductive layer above or below one of the surfaces of the dielectric layer; and, C) a temperature sensitive color indicator layer in thermal contact with the conductive layer characterized in that the conductive layer has i) thermal insulating means under one of its surfaces and ii) sufficient heat generating capacity to affect a change in the temperature sensitive color indicator layer. The voltmeter cna be intergrated into a label and attached directly to a battery.
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 August 13, 1990 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 2012.
- 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.