High efficiency water heater construction
CA 1305897 C · Owner: Haag, Wilbur L. Jr. · Inventors: Daugirda, Paul G.; Haag, Wilbur L. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multistage gas fired water heater includes a primary heating tank and a secondary tank mounted vertically over the primary tank with a plurality of primary flues located within the primary heating tank aligned with secondary flues located within the secondary tank. One of the primary flues is constructed to operate as a condensate removal pipe for draining water which forms in the secondary flues. The designated condensate removal pipe prevents water from trickling down the other primary flues or collecting in the flue manifold.
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
- Granted August 4, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 2009.
- 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.