Recording/reproducing device
CA 2407525 A1 · Owner: Sony Corporation · Inventors: Kobayashi, Shoei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A recording/reproducing device suitably used in recording or reproducing data to/from an optical disk having two recording layers on one surface thereof and a program. An optical disk having two layers on one surface one unformatted recording film (L0) layer and one formatted recording film (L1) layer, wherein the recording film (L0) layer is formatted by a mark in step S1, the formation of a mark corresponding to record data is started with the recording film (L0) layer first in step S2 and, after the recording film (L0) , layer is used up a mark corresponding to record data is formed on the recording film (L1) layer in step S3. This device can be applied to e.g. DVD players.
Read the whole patent
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 February 25, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 25, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 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.