Improved pour-in-place water heater foam insulation systems
CA 2247396 C · Owner: Green, Berwyn · Inventors: Neill, Paul; Green, Berwyn; Reish, Ralph
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 water heater (12) construction whereby thermal insulation material is foamed in the clearance space between the tank and shell of the water heater, wherein the foamed insulation material has lesser uniformity in cell structure and density and a lesser or smaller density in the upper portion of the volume of foam which is disposed over the top of the inner water tank than in the lower portion of the volume of foam insulation material disposed around the side of the inner water tank. The present invention provides gas and electric water heaters with improved energy efficiency, utilizing a liquid, foam-in-place composite foam insulation system. The …
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 February 28, 1997 and granted February 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 28, 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.