Linear motor for driving an elevator car
CA 2284571 C · Owner: Thyssenkrupp Aufzugswerke Gmbh · Inventors: Jessenberger, Ralf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to design a linear motor for lifts for driving a lift car guided in a lift shaft with at least one stator winding row which can be fixed to the lift shaft or to the lift car and with at least one row of exciter magnets of alternating polarity which are situated opposite the stator windings at a distance and which can be fixed to the lift car or the lift shaft respectively, in such a way that the linear motor exerts only small transverse forces on the motor support and also operates as noiselessly as possible and is easy to assemble it is, proposed that the stator windings are of iron-free design and are disposed between two mutually oppositely situated exciter magnet rows. In …
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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 February 6, 1998 and granted November 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 6, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 6, 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.