Data recording method and apparatus for optical memory cards
CA 2242164 C · Owner: Kimura, Yasuyuki · Inventors: Kimura, Yasuyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A data recording method and device for an optical memory card which is adapted to prevent a recording error due to step-out during a data recording operation and minimize a, decrease in the recording capacity of an optical memory card. While data are recorded an output from an SYNC mark detection, circuit (2) and an output from an internal synchronization signal generation circuit (3) are compared with each other in a comparator circuit (4). When step-out occurs a write signal, generation circuit (5) is stopped and the data recording operation is interrupted, and a re-recording operation is started at a frame adjacent to the frame in which a recording error occurred, on the basis of the …
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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 10, 1997 and granted May 15, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.