Optical disk data reproducing apparatus
CA 2033565 C · Owner: Ito, Motoshi · Inventors: Ito, Motoshi; Ishibashi, Kenzo; Inoue, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention describes an optical disk data reproducing apparatus for reading and reproducing from an, optical disk, data having an address period an automatic, laser power control (ALPC) period and a data period. The apparatus comprises an optoelectric conversion system for reading data and converting the data to an electrical signal; an automatic gain control system for receiving and changing the amplitude of the electrical signal; and an ALPC period detecting systems for detecting the ALPC period in the data and for producing an ALPC period signal indicative of the ALPC period.
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 January 3, 1991 and granted April 2, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 3, 2013.
- 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.