Linear motor
CA 2133015 C · Owner: Iwasa, Takao · Inventors: Satomi, Hirobumi; Iwasa, Takao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A linear motor is operated as an m-phase linear pulse motor or a brushless DC linear motor capable of producing large driving force. The linear motor includes an even number N of salient poles 11, 12, ... disposed at an equal pitch angle and includes a stator 1 having a plurality of permanent magnet poles disposed on inner peripheral surfaces of the salient poles to have polarities different from each other in the shaft direction and a mover 3 disposed movably in the shaft direction. The salient poles are constituted by pairs of the salient poles adjacent to each other and include m sets of salient pole groups each composed of (N/m) salient poles disposed at an angle of (720m/N) degrees and …
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 27, 1994 and granted September 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 27, 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.