Passive and active escapement for sound resonance
CA 2459954 A1 · Owner: Lecocq, Patrick · Inventors: Perrichon, Claude-Annie; Piccaluga, Pierre; Lecocq, Patrick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In pressure-free condition, music is produced automatically by resonance of free matter. In this instance of freedom sound is produced and propagated. If , a finger is softly placed on an excited resonating bell the sound of the bell , stops. In the field of electrical sound reproduction the sound emitters such , as loudspeaker diaphragms are always excited by the following note and hardly have time to resonate. As opposed to musical instruments which require an escapement, the field of electrical sound reproduction disregards this. The present method aims at creating systematic micro-interruptions of the electric audio signal, thereby providing freedom to the diaphragm and an …
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 September 5, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 5, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 5, 2024.
- 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.