Detect stepper motor movement by sensing induced emf on motor windings
CA 2394972 A1 · Owner: Chian, Brent · Inventors: Chian, Brent
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for and method of monitoring the operation of a stepper motor used to control the main burner valve of a gas appliance. The gas appliance has a pilot burner. A thermopile thermally coupled to said pilot burner produces an electrical output which powers the stepper motor and a control microprocessor. The control microprocessor monitors the waveforms of potential induced by rotational motion into the unenergized stator coils of the stepper motor. By analyzing the waveforms, the microprocessor can monitor the start time, stop time, and direction of the rotational motion.
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 November 13, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 13, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 13, 2022.
- 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.