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Expired Canadian patentCanada

Head driving apparatus

CA 1325272 C · Owner: Sony Corporation · Inventors: Takahashi, Kiyoshi; Noda, Masayuki

CIPO record

Overview

Drawings and full text

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

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Abstract From the Canadian patent

A head driving apparatus for displacing a magnetic head comprises a plurality of slender rods the, respective ends of which are fixed to one another. The slender rods are intertwisted together by a motor or the like which is connected to one ends thereof so that the, other ends of the slender rods are finely displaced against the force of a urging means, such as a coiled spring. Thus, it is easy to make the apparatus noise and motor capacity small.

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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 December 14, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 14, 2010.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 15, 1988
GrantedDecember 14, 1993
Term endedDecember 14, 2010
Patent numberCA 1325272 C
Classification (IPC)G11B21/08 +2 more

Timeline

Timeline From CIPO dates

19891992199519982001200420072010Application filedAug 15, 1988Patent grantedDec 14, 1993Term endedDec 14, 2010

Sources & verification

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