High-density dual-layer optical disc
CA 2455889 A1 · Owner: Lg Electronics Inc. · Inventors: Park, Kyung Chan; Jeong, Seong Yun; Kim, Jin Yong
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high-density dual-layer optical disc of the present invention is configured so that the first substrate thickness from the light incidence surface of a transparent substrate to the first recording layer is equal to a value obtained by subtracting half the distance between the first and the second recording layers from the substrate thickness from the light incidence surface of a transparent substrate to a recording layer in a general high-density single layer optical disc, and the second substrate thickness from the light incidence surface to the second recording layer is equal to a value obtained by adding half the distance between the two recording layers to the substrate …
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 June 4, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 4, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 4, 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.