Component with surface acoustic waves eliminating pyroelectric interface
CA 2263358 A1 · Owner: Dufilie, Pierre · Inventors: Friquet, Olivier; Dufilie, Pierre; Desbois, Jean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a component with surface acoustic waves including a substrate made of piezoelectric and pyroelectric material with electric conductivity sigma o comprising on one of its surface an electroacoustic transducer connected to an input (E) an output (S) and an earth connection (PM) said material having an electric polarisation P. The invention is characterised in that the surface of the planes perpendicular to the polarisation P have an electric conductivity sigma o and are connected to the earth (PM) so as to enable the current sink of pyroelectric charges occurring during the operation of the electroacoustic transducer. The invention is applicable in telecommunication …
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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 June 5, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2020.
- 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.