Active control of machine performance
CA 2076351 C · Owner: Noise Cancellation Technologies Inc. · Inventors: Langley, Andrew John; Eatwell, Graham Paul; Ross, Colin Fraser
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A control system is described for improving continuous dynamical control on the pressure in the outlet or inlet system or both of a machine in order to control the performance of the machine. The system comprises an actuator for varying the pressure in the selected system a sensor for, monitoring the operation of the machine and producing a signal indicative thereof, and a controller responsive to the sensor signals for driving the actuator, wherein the controller operates to adjust the machine performance according to predetermined data, to optimise the machine performance. The data may be in a memory (look-up table) or the controller may operate in accordance with an algorithm. A second …
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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 20, 1991 and granted June 13, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 2013.
- 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.