Rotary electric apparatus and generator/motor using said rotary electric apparatus
CA 2250048 C · Owner: Ueda, Tomoaki · Inventors: Hayasaka, Shigeaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotary electric apparatus; and a generator and a motor respectively using the rotary electric apparatus. Said rotary electric apparatus comprises a rotary shaft (1) a stator (2) being disposed by, way of surrounding external periphery of the shaft (1) and a pair of, rotors (3N) and (3S) integrally disposed onto the shaft at both-side positions of the stator (2). The rotor (3N) comprises a plurality of N-polar magnetic poles and the other rotor (3S) comprises S-polar magnetic poles by the same number as that of the rotor (3N). The N and S magnetic poles set to the rotors are disposed at equal angles in the state of being opposed to each other in the axial direction of the shaft (1). The …
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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 January 21, 1998 and granted October 10, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 21, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 2020.
- 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.