Disc-shaped recording medium, disc driving device and disc producing method
CA 2486969 C · Owner: Koninklijke Philips Electronics N.V. · Inventors: Yamagami, Tamotsu; Kadowaki, Shin-Ichi; Borg, Hermanus Johannes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
With the disc-shaped recording medium, or the disc manufacturing method according to the present invention, for both the single-layer disc and the multi-layer disc, a recording layer L0 which is to be the first layer, is at the same distance, along the direction of disc thickness from the surface of , the cover layer CVLs on which falls the laser light. For the multi-layer disc the second layer L1 and the following layer(s) are formed at the locations which are closer to the cover layer CVLs than the first layer L0. Management information may be recorded by mobbling grooves each layermay have tert , areas, defect information a replacement area. Thus, it is possible to improve …
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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 May 22, 2003 and granted December 18, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 22, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 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.