Optical disk medium, and data recording method and device
CA 2418666 C · Owner: Sony Disc & Digital Solutions Inc. · Inventors: Tsukahara, Makoto; Saito, Akiya; Yanagisawa, Yoshitake
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A molding and film forming apparatus 700 molds a disc substrate from a stamper 330 formed from an optical disc disc-master 320 and forms a coating film for example, a reflective film onto the disc substrate thereby forming , a recorded optical disc 360. A postscript apparatus 200 writes postscript information once onto an optical disc 340 formed by the molding and film forming apparatus 700. As postscript information, a laser beam is irradiated to a predetermined interval of the optical disc 340 a portion , which is detected as a pit is formed and an optical disc , 350 on which postscript information 420 has been recorded is formed. Identification information which enables each …
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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 June 3, 2002 and granted January 22, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 3, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 3, 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.