Magnetic disk apparatus with actuator control
CA 2108523 C · Owner: Nec Corporation · Inventors: Okawa, Toshiyuki; Saito, Kazuhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnetic disk apparatus comprises at least one magnetic recording medium having a plurality of servo sectors each storing servo information and at least one magnetic head for selectively writing or reading data in or out of a recording surface of the magnetic recording medium. An actuator moves the magnetic head to a designated cylinder position over the magnetic recording medium. Position control means calculates control current data on the basis of the servo information read out of one of the plurality of servo sectors holding the, control current data for a predetermined period of time outputting the control current data before the servo information of the next servo sector is fully …
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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 October 15, 1993 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 15, 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.