Apparatus and method for transducer crosstalk cancellation in a disk drive system
CA 2054072 A1 · Owner: Hanks, D. Mitchell · Inventors: Barnes, Ted W.; Hanks, D. Mitchell
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a dedicated servo type of disk drive the effect of, coupling of the electromagnetic field from a data head to a servo head, in a data writing, track-following mode of operation, is eliminated by subtracting the write signal component from the signal produced by the servo head.
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 October 23, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 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.