Overlay-coil speaker with direct coupling
CA 1136554 A · Owner: Wood, Vencin P. · Inventors: Nagel, Martin J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A loudspeaker with an overlay voice coil and directly coupled push-pull audio amplifier circuit is disclosed. The overlay configuration compensates for increased input impedance at high frequencies by introducing a transformer coupling between two co-axial voice coils. The resultant input impedance remains fairly constant over a large frequency range, thereby insuring uniform power transfer to the speaker.
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 November 30, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 30, 1999.
- 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.