Vertical synchronizing signal detector
CA 2013348 C · Owner: Thomson Consumer Electronics, Inc. · Inventors: Fling, Russell Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A detector for vertical synchronizing pulses comprises a nonwrapping up/down counter and a comparator. The counter samples the level of a composite synchronizing signal at a sampling rate. The counter has a numerical output which increases responsive to detection of said level during a sample interval and decreases responsive to nondetection of said level during a sample interval. The comparator generates a vertical sync detection pulse when the numerical output of the counter is greater than a reference value. In order to provide hysteresis the, numerical value is alternately one of first and second numerical reference counts, the first reference count being greater than the second …
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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 March 29, 1990 and granted June 1, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 29, 2012.
- 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.