Improvement to a hot water heater
CA 2422932 A1 · Owner: Mackelvie, Winston R. · Inventors: Mackelvie, Winston R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A safety and energy saving improvement to a hot water heater whereby water can be heated, to a high temperature (scalding hot) required for sanitizing and energy storage, but then is is, internally cooled to a lower non-scalding temperature before it leaves the heater. This is, accomplished by means of a low-cost internal heat exchanger. In its simplest form, the internal, heat exchanger is a vertically oriented tube structure one end of which is open to the hottest, water at the top of the tank and the other end of which exits the tank. By sending the hottest, water downwards through this tube the hot water passes through the cooler layers of water in, the tank and so gives up heat …
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 March 19, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 19, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 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.