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Expired European patentEurope

Magnetic head device for magnetooptical disc system and magnetic head driving circuit

EP 0556074 B1 · Applicant: SONY CORPORATION

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed January 14, 1993 and granted December 2, 1998. A European patent lasts at most 20 years from filing, so its term ended January 14, 2013.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by July 14, 2018.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledJanuary 14, 1993
PublishedAugust 18, 1993
GrantedDecember 2, 1998
Term endedJanuary 14, 2013
Application numberEP 93400084
Classification (CPC)G11B11/10508 +1 more

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Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

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