Information recording method and apparatus, and information recording medium
CA 2785131 C · Owner: Sony Corporation · Inventors: Van Gestel, Wilhelmus Jacobus; Kato, Motoki; Gotoh, Yoshiho
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Congested rewriting in the same area is to be evaded to suppress the tendency towards occurrence of defective areas. When a stream 1 has been recorded the last written address, representing the last written position is stored. When recording a stream 2 next recording is started directly following the position indicated by the last written address for the stream 1. The last written address corresponding to the last address of the recording position is stored. If the stream 2 is erased for recording a stream 3 recording is started not at a position directly following the last written address of the stream 1 but from a position directly following the last written address of the stream 2. When …
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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 29, 2002 and granted April 26, 2016. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2024.
- 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.