Mems gyroscope with parametric gain
CA 2483710 A1 · Owner: Johnson, Burgess R. · Inventors: Johnson, Burgess R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A microelectromechanical (MEMS) gyroscope has one or more proof masses mechanically coupled to a substrate by springs. A motor force drives the proof masses at their resonant frequency in one direction 180 degrees out of phase , with each other in the case of a dual proof mass gyroscope. Sense electrodes sense motion of the proof masses in response to a Coriolis force. The motion caused by the Coriolis force is perpendicular to the motion caused by the motor force. An AC pump voltage at twice the motor frequency is applied to the sense electrodes to provide parametric amplification of the Coriolis force. The AC pump voltage alters the mechanical and electrical gain of the gyroscope.
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 April 23, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 23, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2025.
- 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.