Heat exchanger for liquids using double-walled tubes for leak and contamination protection
CA 2476685 C · Owner: Gordon, Michael · Inventors: Bernreuter, Wade; Gordon, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water heater including a tank having a wall defining an interior for holding water is provided. A , heat exchange assembly is positioned at least partially within the tank's interior. The heat , exchange assembly includes an outer tube positioned within the tank's interior. The outer tube , has a wall with an inner surface and end portions positioned within the tank's interior. The heat , exchange assembly further includes an inner tube extending within the outer tube and having , end portions extending through the wall of the tank. A portion of the outer surface of the inner , tube contacts a portion of the inner surface of the outer tube. An elongated passageway is , defined …
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 4, 2004 and granted July 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 4, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 4, 2026.
- 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.