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Expired European patentEurope

Process for the preparation of hydrated zirconium-oxide from granular cristalline zirconiumoxide

EP 0334713 B1 · Applicant: SOCIETE EUROPEENNE DES PRODUITS REFRACTAIRES

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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 March 14, 1989 and granted July 8, 1992. A European patent lasts at most 20 years from filing, so its term ended March 14, 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 September 14, 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.
FiledMarch 14, 1989
PublishedSeptember 27, 1989
GrantedJuly 8, 1992
Term endedMarch 14, 2009
Application numberEP 89400697
Classification (CPC)C01G25/02

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedMarch 14, 1989PublishedSep 27, 1989Patent grantedJuly 8, 1992Term endedMarch 14, 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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