Speaker unit
CA 2353595 A1 · Owner: Kobayashi, Hachishiro · Inventors: Kobayashi, Hachishiro; Koizumi, Hiroshi; Hirosawa, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A speaker unit includes a pole piece having a through hole in the center. A lamp is provided on the front end of the through hole and a transparent , plastic center cap is provided in front of the lamp. The lamp is connected in series with the voice coil. The speaker unit emits light whose luminance varies with the speaker drive current while generating sound.
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 October 4, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 4, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 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.