Signal processing means for identifying systems subject to periodic disturbances
CA 2001199 C · Owner: Topexpress Limited · Inventors: Ross, Colin Fraser; Eatwell, Graham Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a signal processing system for a plant such as a motor or machine, subject to disturbances which are approximately periodic and wherein a signal (T/t) time related to the disturbances is available the plant, response is sampled in an ADC triggered by the signal (T(t)) in order to synchronise the sampling process with the cyclic disturbances, and a processing means derives from the sampled signals an estimate of the disturbances and thereby of that part of the plant output due to unknown inputs (Figure 2), the estimate of disturbances possibly being used to drive an active vibration control system employed in combination with the sampling system.
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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 October 23, 1989 and granted August 11, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2011.
- 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.