Cage-type induction motor for high rotational speeds
CA 2316708 C · Owner: Ishikawajima-Harima Heavy Industries Co. Ltd. · Inventors: Ozaki, Shinichi; Takahashi, Toshio; Hasegawa, Kazumitu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotor 10 has a structure with a rotor core 12 and rotor conductors 14 the rotor core 12 is made of a weakly magnetic substance with a high permeability and a relatively low electrical conductivity and the rotor conductors 14 are composed of a conducting material with a low permeability and a relatively high electrical conductivity. Also the rotor core 12 and the rotor conductors 14 are formed into a single body that has an entire surface with a smooth cylindrical shape. Furthermore a stator 20 is composed of a plurality of stator sheets 22 laminated in the axial direction and a stator winding 24. Each stator sheet is formed with a closed circular inner ring portion 22a and an outer ring …
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 August 23, 2000 and granted May 15, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 23, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 23, 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.