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Expired Canadian patentCanada

Method and apparatus for preserving data-recording status of a write-once recording medium, and write-once recording medium therefor

CA 2497770 C · Owner: Ko, Jung-Wan · Inventors: Hwang, Sung-Hee; Ko, Jung-Wan; Lee, Kyung-Geun

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A write-once recording medium preserving a data recording status of the writeonce recording medium, a method of preserving the data recording status of a write-once recording medium, a medium including computer readable code for the same, and a recording and/or reproducing apparatus therefor. In the method of preserving the data recording status of a write-once recording medium first, data is recorded on the write-once recording medium. Next recording-status , data, representing occupied areas is produced and recorded in a temporary defect management area allocated in the write-once recording medium. Thereafter, a finalization command is received to preserve the data-recording status …

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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 March 4, 2004 and granted May 8, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 4, 2024.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 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.
FiledMarch 4, 2004
GrantedMay 8, 2012
Term endedMarch 4, 2024
Patent numberCA 2497770 C
Classification (IPC)G11B7/00

Timeline

Timeline From CIPO dates

2005200720092011201320152017201920212023Application filedMarch 4, 2004Patent grantedMay 8, 2012Term endedMarch 4, 2024

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.