Electronic shorting of wound rotor windings
CA 2382352 C · Owner: Dymond, James H. · Inventors: Ong, Raymond K.J.; Dymond, James H.; Derr, Dale
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for shorting rotor windings (24) in a wound rotor (10) induction machine is , disclosed. The method includes the steps of monitoring rotor current for a frequency , indicative of a desired steady-state operating condition and electronically shorting the , rotor windings when the monitored rotor current frequency reaches a defined threshold indicative of the desired steady-state operating condition.
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 April 18, 2002 and granted June 7, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 18, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 18, 2024.
- 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.