High ratio modulation combustion system and method of operation
CA 2129256 C · Owner: Pvi Industries, Inc. · Inventors: Ferguson, Mark A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A combustion system is shown having a combustion chamber into which fuel is introduced and ignited in the presence of air to create products of combustion which are routed through an exhaust vent. A forced draft burner intakes air and fuel and ignites these components to supply heat to the combustion chamber. A valve is provided within the exhaust vent for varying the degree of restriction within the exhaust vent. A modulation drive motor is connected to the variable restriction in the exhaust vent and to the air and fuel supply sources for increasing the exhaust vent back pressure as the ratio of air and fuel being supplied to the combustion chamber are decreased.
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 July 22, 1994 and granted October 17, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 22, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 22, 2016.
- 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.