Piezoelectric transducer apparatus
CA 1183937 A · Owner: Motorola, Inc. · Inventors: Bost, Jonathan R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electroacoustic loudspeaker apparatus is provided including a piezoelectric driver element the opposed, major surfaces of which are acoustically coupled into first and second resonant structures. The first resonant structure exhibits a resonant frequency less than the resonant frequency of the driver and the second resonant structure exhibits a resonant frequency greater than the resonant frequency of the driver thus resulting in a broadened or enhanced frequency response.
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
- Granted March 12, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 12, 2002.
- 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.