Proportional band temperature control for one or more heating elements
CA 2366243 C · Owner: Bradenbaugh, Kenneth A. · Inventors: Bradenbaugh, Kenneth A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water heater having a water tank and multiple electric resistance heating elements extending into the water tank for heating water in the tank. The water heater , includes a proportional band temperature controller for conducting electric power to the , electric resistance heating elements in bursts. Each burst of electric power is followed by , a period during which the temperature controller does not conduct power to the electric , resistance heating element. In one embodiment each burst of electrical power , lasts for about 95% or less of a cycle comprised of one burst of electric power followed by the , period during which the temperature controller does not conduct electric …
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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 December 28, 2001 and granted March 29, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 28, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 2023.
- 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.