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Expired European patentEurope

Process for the preparation of calcium sulphate anhydrite and curable calcium sulphates

EP 0237802 B1 · Applicant: Gebr. Knauf Westdeutsche Gipswerke KG

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Overview

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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 February 14, 1987 and granted May 9, 1990. A European patent lasts at most 20 years from filing, so its term ended February 14, 2007.
  • 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 August 14, 2012.
  • 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.
FiledFebruary 14, 1987
PublishedSeptember 23, 1987
GrantedMay 9, 1990
Term endedFebruary 14, 2007
Application numberEP 87102121
Classification (CPC)C04B11/024 +1 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedFeb 14, 1987PublishedSep 23, 1987Patent grantedMay 9, 1990Term endedFeb 14, 2007

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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