Digital phase comparator and phase-locked loop
CA 2105233 C · Owner: Rieder, Klaus-Hartwig · Inventors: Rieder, Klaus-Hartwig
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A digital phase comparator measures the phase difference of two signals (S1, S3) from a third signal (S2), and calculates the difference. The zero crossing, of the two signals respectively sets two flip-flops (11 12). If both flip-, flops are, set, they are simultaneously reset with a delay. Each set flip-flop enables a corresponding counter (13, 14). An evaluation unit averages the counter outputs, at major intervals. The phase comparator can be incorporated into a phaselocked, loop.
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 August 31, 1993 and granted October 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 31, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 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.