Disc recording and/or reproducing method and apparatus
CA 2061374 C · Owner: Sony Corporation · Inventors: Fujisawa, Hirotoshi; Mukawa, Hiroshi; Ando, Ryo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A disc recording and reproducing apparatus for use with a disc cartridge which includes an exterior indicator for indicating a reflectance of an optical disc housed in a, cartridge body thereof, the disc recording and reproducing apparatus including a detector for, detecting the exterior indicator and a setting control circuit for initially setting an output level, of a laser light irradiated on the optical disc based on a detection output from the detector, before beginning recording or reproducing operations.
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 17, 1992 and granted October 10, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2014.
- 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.