Write-once optical disc, and method and apparatus for recording/playback management information on/from optical disc
CA 2534984 C · Owner: Park, Yong Cheol · Inventors: Park, Yong Cheol
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A write-once optical disc, and an apparatus and method for recording management information on the optical disc are provided. The disc includes at least one recording layer, a plurality of temporary defect management, areas (TDMAs) on the at least one recording layer and a plurality of defect, management areas (DMAs) on the at least one recording layer. At least one of the, TDMAs includes first and second indicators. The first indicator indicates which, TDMA is an in-use TDMA, and the second indicator indicates whether or not the recording medium is closed.
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 August 4, 2004 and granted October 9, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 4, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 4, 2026.
- 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.