Brushless motor
CA 2117817 C · Owner: Krause, Kenneth W. · Inventors: Krause, Kenneth W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A wholly digital control for a motor having an armature is provided herein. Such system includes a main digital signal processor for supplying a digital input command signal indicative of a desired motor operation. Such system also include a drive controller in digital communication with the main processor, for generating for each phase of, the motor, and in response to the digital input command signal, a digital commutation signal to move the armature and a digital pulse width modulated signal having a duty cycle established by the input command signal. Such system also include switching means in digital communication with the controller, for generating, for each phase and in, response to …
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 October 11, 1994 and granted September 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 11, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 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.