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Expired European patentEurope

Burned anhydrite, procedure for its production and its use

EP 0492567 B1 · Applicant: Gebr. Knauf Westdeutsche Gipswerke 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 December 22, 1991 and granted March 1, 1995. A European patent lasts at most 20 years from filing, so its term ended December 22, 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 June 22, 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.
FiledDecember 22, 1991
PublishedJuly 1, 1992
GrantedMarch 1, 1995
Term endedDecember 22, 2011
Application numberEP 91122093
Classification (CPC)C04B11/05

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedDec 22, 1991PublishedJuly 1, 1992Patent grantedMarch 1, 1995Term endedDec 22, 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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