Phase locked loop
CA 1077144 A · Owner: Sony Corporation · Inventors: Ohsawa, Mitsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A phase locked loop includes a variable frequency oscillator, a phase comparator for comparing the phase between an output signal derived prom the variable frequency oscillator and a reference signal and for generating a control signal is response to the phase difference of both of signals so as to control the variable frequency oscillator, an indicator for indicating the phase difference of both the signals, and a control circuit for varying the frequency of the variable frequency oscillator.
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 May 6, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 6, 1997.
- 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.