Methods, optical recording apparatus using such methods and optical recording medium for use by the methods and the apparatus
CA 2406728 C · Owner: Xu, Cai G. · Inventors: Stek, Aalbert; Van De Pas, Joris; Spruit, Johannes H. M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods and an optical recording apparatus using these methods are described in which an optimum write power of a radiation beam in the apparatus is set by writing a series of test patterns on the optical recording medium forming a , read signal from the patterns and processing the read signal. Such processing involves fitting a function, preferably a straight line to parameters , obtained from the read signal without having to perform a differentiation step. An optical recording medium for use by the methods and the apparatus is also described.
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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 November 12, 2001 and granted April 2, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.