Information recording medium, recording apparatus, reproduction apparatus, recording method and reproduction method allowing for updating of a defect list
CA 2479487 C · Owner: Matsushita Electric Industrial Co. Ltd. · Inventors: Takahashi, Yoshihisa; Ito, Motoshi; Ueda, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An information recording medium includes a data area for recording user data and a defect management area for recording a defect list for managing N number of defect areas existing in the data area where N is an integer satisfying N , 0. The defect list includes a header located at a fixed position in the defect list, N number of defect entries respectively including position information on positions of the N number of defect areas and an anchor. The header, the N , number of defect entries and the anchor are located in this order. The header includes a defect list identifier for identifying the defect list first , update times information, and a defect entry number representing the …
Read the whole patent
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 February 27, 2003 and granted January 22, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2025.
- 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.