Unvented heating appliance having system for reducing undesirable combustion products
CA 2200800 A1 · Owner: Barkhouse, Sydney R. · Inventors: Rieger, Heinz H.; Barkhouse, Sydney R.; Campbell, Larry E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gas-fueled heating appliance having a system for reducing the amount of undesirable combustion products released to the site in which the appliance is installed. The appliance includes a firebox partially surrounded by a heat exchanger. Ambient air is drawn into the heat exchanger below the firebox and a portion of the ambient air enters the firebox to assist in combustion, and the remaining portion travels through the heat exchanger to be heated by convection before being combined with combustion gasesexiting through the top of the firebox. The heat exchanger creates a low pressure area relative to the firebox which induces a draft from the firebox into the heat exchanger and ultimately …
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 24, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 24, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 24, 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.