Carrier phase lock detecting apparatus used in psk-modulated signal receiver for satellite communication system
CA 2108217 C · Owner: Nec Corporation · Inventors: Tsuda, Hiroki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a PSK-modulating arrangement including a voltage controlled oscillator (VCO), a demodulator a phase, detector and a loop filter, a carrier phase lock detecting apparatus is equipped with the arrangement the apparatus, comprising a first multiplier for inversely modulating a demodulated signal by a reference carrier signal from the VCO, a second multiplier for multiplying the output of the first multiplier by an input PSK-modulated signal and a decision circuit for detecting carrier phase lock in response to the output of the second multiplier.
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 12, 1993 and granted October 13, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 2015.
- 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.