Down fired u-tube water heater
CA 2088644 C · Owner: Hanning, David M. · Inventors: Hanning, David M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A down-fired water heater has a top storage tank head portion with a central opening bordered by an upstanding annular flange. Welded within this flanged opening is a generally pan-shaped tube sheet structure having an open top side and a bottom side wall in, which a spaced pair of openings are formed. The open top ends of a U-tube immersion heating member, formed from a single length of metal tubing, are upwardly received and welded within these openings. During water heater operation a top mounted shot-type, fuel burner downwardly injects a flame and resulting hot, combustion gases, into one of the open upper ends of the U-tube. A top mounted draft inducer fan with an inlet communicated …
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 2, 1993 and granted September 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 2, 2015.
- 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.