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Expired European patentEurope

Spinel-type spherical black iron oxide particles and process for producing the same

EP 0487230 B1 · Applicant: TODA KOGYO CORP.

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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 8, 1991 and granted July 12, 1995. A European patent lasts at most 20 years from filing, so its term ended November 8, 2011.
  • 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 8, 2017.
  • 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 8, 1991
PublishedMay 27, 1992
GrantedJuly 12, 1995
Term endedNovember 8, 2011
Application numberEP 91310366
Classification (CPC)G03G9/0835 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedNov 8, 1991PublishedMay 27, 1992Patent grantedJuly 12, 1995Term endedNov 8, 2011

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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