Catalytic vent free gas heather with isolated exhaust plenum
CA 2266178 A1 · Owner: Rigney, Donald P. · Inventors: Rigney, Donald P.; Schweiss, John A.; Ferguson, Robert Whitbeck
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A catalytic vent free gas-fired heater includes a primary combustion chamber a secondary combustion chamber having a catalytic converter for secondarily combusting the products of combustion produced in the primary combustion chamber, a catalytic converter plenum communicating with the exhaust of the catalytic converter for exhausting the catalytic converter outside the heater in a direct manner. A separate room air convection air plenum is provided which rises vertically up the, back of a heater and out over the top of the catalytic converter to the front thereof. As, the plenums are separated and do not communicate a blower may be conveniently, provided to force air through the room …
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 18, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 18, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 18, 2021.
- 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.