Acceleration sensor suitable for self-checking and a self-checking circuit therefor
CA 2074157 A1 · Owner: Tanaka, Nobuo · Inventors: Gohkura, Akira; Mukasa, Yoshinao; Tanaka, Nobuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an acceleration sensor device suitable for self-checking during vehicle driving and a self-checking circuit. Therefore an acceleration sensor device suitable for self-checking during driving is obtained by a planar vibrator consisting of piezoelectric area having piezoelectricity and non-piezoelectric area having no piezoelectricity, a plurality of first electrodes provided on an upper face of said piezoelectric area of the planar vibrator at least one second electrode provided on an upper face of said nonpiezoelectric area of the planar vibrator and a third electrode, means provided on lower face of the planar vibrator.
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 July 17, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 17, 2014.
- 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.