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Expired European patentEurope

Process for creating dams in mines from foamed plaster or anhydride, device for carrying out the process, and mixture utilised

EP 0094331 B1 · Applicant: A. WEBER, S.A.

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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 6, 1983 and granted September 18, 1985. A European patent lasts at most 20 years from filing, so its term ended May 6, 2003.
  • 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 6, 2008.
  • 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 6, 1983
PublishedNovember 16, 1983
GrantedSeptember 18, 1985
Term endedMay 6, 2003
Application numberEP 83440028
Classification (CPC)C04B28/14 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedMay 6, 1983PublishedNov 16, 1983Patent grantedSep 18, 1985Term endedMay 6, 2003

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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