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Expired European patentEurope

Plate-like barium ferrite particles suitable for use in magnetic recording and process for producing the same

EP 0232131 B1 · Applicant: TODA KOGYO CORP.

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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 January 29, 1987 and granted September 18, 1991. A European patent lasts at most 20 years from filing, so its term ended January 29, 2007.
  • 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 29, 2012.
  • 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 29, 1987
PublishedAugust 12, 1987
GrantedSeptember 18, 1991
Term endedJanuary 29, 2007
Application numberEP 87300779
Classification (CPC)G11B5/70678

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedJan 29, 1987PublishedAug 12, 1987Patent grantedSep 18, 1991Term endedJan 29, 2007

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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