Compressor control system for a portable ventilator
CA 2531889 C · Owner: Pulmonetic Systems, Inc. · Inventors: Holmes, Michael; Boyle, David; Williams, Malcolm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for controlling a brushless DC (BLDC) motor over a wide range of angular speeds is presented. Analog magnetic sensors provide continuous signal measurements related to the rotor angular position at a sample rate independent of rotor angular speed. In one embodiment analog , signal measurements are subsequently processed using an arctangent function to obtain the rotor angular position. The arctangent may be computed using arithmetic computation, a small angle approximatiOl.sim.i a polynomial evaluation approach .sim. a table lookup approach or a combination of various , methods. In one embodiment the BLDC rotor is used to drive a Roots blower used as a. …
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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 August 3, 2004 and granted August 2, 2016. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 3, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 3, 2026.
- 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.