Optical recording or reproducing apparatus for data from an optical disc having uniform structure
CA 2766081 C · Owner: Samsung Electronics Co. Ltd. · Inventors: Park, In-Sik; Lee, Kyung-Geun; Yoon, Du-Seop
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical disc is manufactured under a uniform condition by forming grooves and lands on the entire surface of the disc. The optical disc is configured to obtain a reliable reproduction signal and the grooves and lands are formed on a lead- in area a user data area and a lead-out area of the optical disc. Since the same manufacturing condition can be adopted in mastering discs the yield can be enhanced and the manufacturing cost can be reduced.
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 May 1, 2002 and granted December 11, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 1, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 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.