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Expired European patentEurope

Magnetic iron oxide particles and method of producing the same

EP 0377933 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 April 21, 1989 and granted July 19, 1995. A European patent lasts at most 20 years from filing, so its term ended April 21, 2009.
  • 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 October 21, 2014.
  • 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.
FiledApril 21, 1989
PublishedJuly 18, 1990
GrantedJuly 19, 1995
Term endedApril 21, 2009
Application numberEP 89304015
Classification (CPC)G11B5/70694

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedApril 21, 1989PublishedJuly 18, 1990Patent grantedJuly 19, 1995Term endedApril 21, 2009

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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