Motor control system and apparatus for providing desired three-phase voltage therein using a main transformer energized through an auto transformer
CA 2131971 C · Owner: Southwest Electric Company · Inventors: Owen, Donald W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A motor control system and apparatus for providing a desired three-phase voltage in the motor control system include: (1) a main transformer and components that are rated for one nominal voltage input, and (2) a commonly housed input transformer that transforms a different voltage power source to provide the nominal voltage input to the main transformer.
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 September 12, 1994 and granted February 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 12, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 12, 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.