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Expired Canadian patentCanada

Magnetic head of floating type and process for producing same

CA 1319427 C · Owner: Koga, Kazuhiko · Inventors: Ueta, Yutaka; Koga, Kazuhiko; Inoue, Atsushi

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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 floating-type magnetic head comprising a slider and a core chip secured thereto. The core chip comprises a pair of core segments joined together with a gap spacer and a thin ferromagnetic metal film which are formed at the joint only over a portion of the entire area of the joint which portion terminates at the face of the core chip to be opposed to magnetic recording media. The two core segments area bonded to each other with glass present over the remaining portion of the joint area. In producing the magnetic head the core, chip is prepared by fabricating a core block comprising a pair of base plates joined together and strips of thin ferromagnetic metal film and gap spacer provided at …

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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 June 22, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 22, 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.
FiledMay 3, 1989
GrantedJune 22, 1993
Term endedJune 22, 2010
Patent numberCA 1319427 C
Classification (IPC)G11B5/12 +2 more

Timeline

Timeline From CIPO dates

1990199319961999200220052008Application filedMay 3, 1989Patent grantedJune 22, 1993Term endedJune 22, 2010

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