Process for the manufacture of a master disk for the production of optical disk pressing matrices bearing a marking, particularly of the anti-pirate type, a master disk, a pressing matrix and the optical disk obtained
CA 2206364 A1 · Owner: Ledieu, Jean · Inventors: Ledieu, Jean; Andre, Pascal
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a manufacturing process for the creation of an optical disk pressing matrix bearing a marking, particularly of the anti-pirate type. This process consists of interposing between the, turntable (3) of an information recording machine and a support (1) coated with a photosensitive resin (2) a, layer (7) formed by zones of different reflectivity at the wavelengths of the light beam (4) used to record the information, and thus creating a marking. The invention is suitable for application in particular in the area of production of optical disks bearing a marking.
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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 28, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2019.
- 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.