Data recording method and data reproducing apparatus
CA 2047664 C · Owner: Sako, Yoichiro · Inventors: Sako, Yoichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A disc-shaped recording medium (1) is rotationally driven at a velocity equal to N times a rotational velocity of the medium corresponding to the transfer rate of reproduced data so that the same position on the disc-shaped recording medium is scanned M times by a reproducing head (3) so as to read out one-track data M times to store the read out data in a memory (8). One-track playback data are formed from the data stored in the memory and transmitted at a predetermined transfer rate to perform continuous data reproduction even if the reproducing head should be deviated from a track due to vibrations or the like. A disc shaped recording medium (21) is also rotationally driven at a …
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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 January 18, 1991 and granted September 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 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.