Multilayer optical disc having disc information
CA 2519915 C · Owner: Woerlee, Pierre H. · Inventors: Nijboer, Jakob G.; Martens, Hubert C. F.; Woerlee, Pierre H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multi-layer record carrier is for recording information by writing marks in a track. The record carrier has a first recording layer (40) and a second recording layer (41), and each recording layer has a pregroove (14) indicating the position of the track according to an opposite track path. The pregroove exhibits a modulated wobble for representing control information. A lead-in part of the pregroove has first control information for the first recording layer, and the lead-out part on the second recording layer has second control information including recording parameters for the second recording layer. The device the device has a head (22) for providing the beam and wobble …
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 March 9, 2004 and granted July 17, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 9, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 9, 2026.
- 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.