Fm modulator circuit having separate modulation and channel signal paths
CA 2065816 A1 · Owner: Mccune, Earl W. Jr. · Inventors: Twitchell, Edwin R.; Mccune, Earl W. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An FM modulator circuit is provided having separate modulation and channel signal paths. The modulation path includes a numerically controlled modulated oscillator which receives a modulation signal and provides a modulated intermediate frequency signal which has been frequency modulated in accordance with the modulation signal. channel select number is provided representative of a channel of a desired frequency. A channel signal path is provided including local oscillator means for receiving the channel select signal and providing a channel signal of the desired frequency. The modulated intermediate frequency is then combined with the channel signal to provide the desired FM output signal.
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 April 10, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 10, 2014.
- 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.