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Expired European patentEurope

Liquid composition and its use as magneto-rheological liquid

EP 0953034 B1 · Applicant: RWE-DEA Aktiengesellschaft für Mineraloel und Chemie

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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 December 20, 1997 and granted May 23, 2001. A European patent lasts at most 20 years from filing, so its term ended December 20, 2017.
  • 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 June 20, 2023.
  • 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.
FiledDecember 20, 1997
PublishedNovember 3, 1999
GrantedMay 23, 2001
Term endedDecember 20, 2017
Application numberEP 97953659
Classification (CPC)H01F1/44 +1 more

Timeline

Timeline From EPO dates

1998200020022004200620082010201220142016Application filedDec 20, 1997PublishedNov 3, 1999Patent grantedMay 23, 2001Term endedDec 20, 2017

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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