Optical storage system, optical storage medium and use of such a medium
CA 2469083 A1 · Owner: Koninklijke Philips Electronics N.V. · Inventors: Van Den Oetelaar, Ronald J. A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A description is given of an optical storage system comprising an optical storage medium (1) and an optical head device (6). The medium has a substrate (2), a recording stack (3) and an optically transparent protective coating stack (4 and 5), for protecting the recording stack from impact by the optical head device (6). The protective coating stack comprises a multi-layer (4 and 5) of at least: a first layer (5) with a thickness smaller than 40 nm and a surface with a surface energy smaller than 1.5 J/m2 and a second layer (4), adjacent the first layer (5) with a Young's modulus E smaller than 10 GPa and larger than 0,001 GPa. This combination of layers (4 and 5) is very resistant …
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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 December 2, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 2, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 2, 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.