Optical recording medium and use of such optical recording medium
CA 2377619 A1 · Owner: Zhou, Guo-Fu · Inventors: Zhou, Guo-Fu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The optical recording medium (20) has a substrate (1) and a stack (2) of layers provided thereon. A phase change recording layer (5) having a melting , point Tmp is sandwiched between a first (3) and a second (7) dielectric layer. A crystallization-accelerating layer (4 6) is being interposed in contact , with the recording layer (5). Further a reflective layer (8) is present and an optional cover layer (9). The crystallization-accelerating layer (4 6) , consists of a binary metal alloy or a semiconductor and has a melting point Tmg at least 250 ~C higher than the melting point Tmp of the recording layer (5) and has a crystal structure similar to the crystalline state of the recording …
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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 April 9, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 9, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2023.
- 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.