Piezoelectric film sonic emitter
CA 2396347 A1 · Owner: Khuri-Yakub, Pierre · Inventors: Selfridge, Alan Robert; Norris, Joseph O.; Khuri-Yakub, Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A speaker device for emitting subsonic sonic or ultrasonic compression waves comprising a generally hollow drum, a rigid emitter plate (108) attached to the drum (100), and a plurality of apertures (112) formed within the plate which are covered by a thin piezoelectric film disposed across the emitter plate (108). A pressure source is coupled to the drum (100) for developing a biasing pressure with respect to the thin film (104) at the apertures (112) to distend the film (104) into an arcuate emitter configuration capable of constricting and extending in response to variations in the applied electrical input at the piezoelectric film (104) to thereby create a compression wave in a …
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 January 4, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 4, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 4, 2022.
- 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.