Quadrature fm demodulator apparatus
CA 2124879 A1 · Owner: Vtech Communications Ltd. · Inventors: Dormer, Michael William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Quadrature FM Demodulator Apparatus, Abstract A quadrature FM detector apparatus for demodulating an FM signal so as to produce a baseband audio signal. The quadrature FM detector apparatus utilizes a delay circuit, which may comprise a filter or even a digital shift register, for delaying the FM signal by one-quarter of its frequency. The delayed FM signal is then mixed with the original signal to obtain a baseband audio 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 June 1, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 1, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 1, 2016.
- 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.