Method and apparatus for detecting tracking errors
CA 2042899 A1 · Owner: Yanagihara, Naofumi · Inventors: Yanagihara, Naofumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Tracks scanned by a playback head are provided with a first signal recorded in every nth track a second signal, recorded in a track which precedes and is adjacent to each nth track and a third signal recorded in a track which follows and is adjacent to each nth track. When a preceding track is scanned the second signal recorded therein is detected; and at a time delayed from the detection of that second signal the first, signal picked up as a crosstalk component is sensed. When a following track is scanned, the third signal recorded therein is detected; and at a time delayed from the detection of the third signal, the first signal picked up as a crosstalk component is sensed. The difference …
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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 May 17, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2013.
- 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.