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Expired European patentEurope

Metal niobates and/or tantalates, process for their preparation and their use

EP 0580974 B1 · Applicant: H.C. Starck GmbH & Co. KG

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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 May 17, 1993 and granted March 19, 1997. A European patent lasts at most 20 years from filing, so its term ended May 17, 2013.
  • 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 November 17, 2018.
  • 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.
FiledMay 17, 1993
PublishedFebruary 2, 1994
GrantedMarch 19, 1997
Term endedMay 17, 2013
Application numberEP 93108039
Classification (CPC)C01G49/00 +2 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedMay 17, 1993PublishedFeb 2, 1994Patent grantedMarch 19, 1997Term endedMay 17, 2013

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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