Pll circuit for digital display apparatus
CA 2263221 C · Owner: Nishimura, Eizo · Inventors: Kurita, Masanori; Nishimura, Eizo; Kondou, Satoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A PLL circuit is provided with a lock/unlock detecting circuit which detects the locked or unlocked state of the PLL circuit by comparing the phases of a horizontal synchronizing signal and a comparing signal with each other and an internal synchronizing signal generating circuit which outputs the comparing signal as an internal synchronizing signal when the locked state is detected or outputs the horizontal synchronizing signal as the internal synchronizing signal when the unlocked state is detected. Another mode of a PLL circuit is provided with a skew detecting circuit which resets a frequency dividing circuit upon detecting a skew which is deviated from a normal period in an …
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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 November 20, 1996 and granted May 28, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 20, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 2018.
- 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.