Optical disc recording apparatus
CA 2023960 C · Owner: Sony Corporation · Inventors: Ogawa, Hiroshi; Iimura, Shinichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical disc recording apparatus for recording information signals on an optical disc having an optical recording medium with a larger thermal time constant such as an, organic dyestuff base material by irradiating the disc with a, recording light modulated by signals produced by eight fourteen modulation of information signals, is disclosed The apparatus, includes a recording pulse forming unit for forming recording pulses from the eight fourteen modulated signals which recording, pulses are of pulse widths shorter than the eight fourteen modulated signals by a pulse width corresponding to the elongation from the regular length of a pit formed on the recording medium on the basis of the …
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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 August 24, 1990 and granted October 26, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 24, 2012.
- 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.