Piezoelectric acoustic device
CA 2179212 C · Owner: Kanai, Yasuhiro · Inventors: Ito, Fumihisa; Kanai, Yasuhiro; Ito, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A piezoelectric acoustic device comprises a case and a piezoelectric element which is accommodated in the case and has an inner peripheral surface thereof supported by an inner peripheral surface of the case at a middle portion thereof. A plurality of projections are provided on an inner peripheral surface of the case and spaced circumferentially along the inner peripheral surface of the case for supporting the peripheral portion of the piezoelectric element. A gap between the peripheral portion of the piezoelectric element and the inner peripheral surface of the case is closed by an elastic adhesive. A plurality of projections provided on and spaced circumferentially along the inner …
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 June 17, 1996 and granted September 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2018.
- 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.