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Expired European patentEurope

Magnetic head for perpendicular magnetic recording system

EP 0144862 B1 · Applicant: Kao Corporation

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Overview

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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 November 22, 1984 and granted September 6, 1989. A European patent lasts at most 20 years from filing, so its term ended November 22, 2004.
  • 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 May 22, 2010.
  • 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.
FiledNovember 22, 1984
PublishedJune 19, 1985
GrantedSeptember 6, 1989
Term endedNovember 22, 2004
Application numberEP 84114085
Classification (CPC)G11B5/1278 +2 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedNov 22, 1984PublishedJune 19, 1985Patent grantedSep 6, 1989Term endedNov 22, 2004

Sources & verification

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

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

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