Direct gas-fired heating and ventilation system with passive control damper
CA 2242652 C · Owner: Knieriem, Bruce L. · Inventors: Knieriem, Bruce L.; Check, Chris B.; Schmidt, Jay J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gas-fired heating and ventilation system includes a blower which draws air through a recirculation damper from a building and through a direct gas-fired burner from a fresh air inlet. A passive control damper is mounted to bypass air around the burner and to thereby regulate the air flow through the burner for optimum combustion over a wide range of operating conditions.
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 2, 1998 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 2, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 2, 2020.
- 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.