Speaker drive arrangement for loudspeaker telephone
CA 1313432 C · Owner: Bonneville, Marc Etienne · Inventors: Bonneville, Marc Etienne; Wadsworth, Douglas Clifton; Thomas, Terence Neil
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a loudspeaker telephone improved power transfer is, achieved by connecting the drive circuit for the loudspeaker in parallel with the input and output of the usual series regulator the output of the regulator and one of the power supply connections of the drive circuit being connected in common, to, supply other circuitry in the telephone set. This other circuitry might comprise a microprocessor and other signal processing circuitry. Such a configuration means that the current passing through the speaker drive circuit also passes through the other circuitry. In effect it is "re-used" instead, of being added as would be the case if the drive circuit were connected in parallel with the …
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 February 2, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 2, 2010.
- 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.