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Expired Canadian patentCanada

Method and apparatus for pre-recording tracking information on magnetic media

CA 1232066 A · Owner: Irwin Magnetic Systems, Inc. · Inventors: Chambors, John M.; Lum, Francis

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A method and apparatus for initializing a data-recording media, particularly tape by use of the, same type of media drive used for data-recording purposes in which the actual edge of the recordable field on the media is first located by a test read/write process and the media is then transported in a succession of passes across the transducing head, during each of which the head is periodically and selectively energized to write mutuallyspaced marker bursts and servo-positioning bursts with, the transducing head being moved open-loop a distance corresponding to a half-track width between each media transport. During the first such pass, the marker bursts and servo-positioning bursts are …

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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

  • Granted January 26, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 26, 2005.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 27, 1985
GrantedJanuary 26, 1988
Term endedJanuary 26, 2005
Patent numberCA 1232066 A
Classification (IPC)G11B5/55 +2 more

Timeline

Timeline From CIPO dates

1986198819901992199419961998200020022004Application filedFeb 27, 1985Patent grantedJan 26, 1988Term endedJan 26, 2005

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.