Disk recording method and apparatus for identifying and skipping defective clusters
CA 2120352 C · Owner: Obata, Hideo · Inventors: Obata, Hideo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the case where the predetermined data is recorded on the disc in which the divided clusters each having the predetermined section are formed in the track when it is, determined during the recording that the above-mentioned cluster is a defective section, the recording is once stopped and the recording begins again with the cluster offset by the predetermined clusters from the defective cluster whereby even, if there is a partial defect in the track on the disc the data, can be recorded with accuracy.
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 July 30, 1993 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 2015.
- 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.