Gas furnace with improved ignition
CA 2000796 C · Owner: Shellenberger, Timothy J. · Inventors: Shellenberger, Timothy J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A furnace employing a plurality of spaced burners a, carryover tube passing adjacent the burners a hot surface, igniter at one end of the carryover tube a flame sensor at the, other end of the carryover tube and an ignition control for controlling actuation of the hot surface igniter and the flow of combustible gas to the carryover tube and main burners the, ignition control being responsive to the flame sensor.
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 October 16, 1989 and granted October 5, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 16, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 2011.
- 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.