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Expired European patentEurope

Process for anionic mass polymerisation with an alcali-metal azide and a hydroxylate of the same metal

EP 0002159 B1 · Applicant: SOCIETE NATIONALE DES POUDRES ET EXPLOSIFS

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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 November 17, 1978 and granted September 16, 1981. A European patent lasts at most 20 years from filing, so its term ended November 17, 1998.
  • 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 May 17, 2004.
  • 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.
FiledNovember 17, 1978
PublishedMay 30, 1979
GrantedSeptember 16, 1981
Term endedNovember 17, 1998
Application numberEP 78400187
Classification (CPC)C08G63/823 +2 more

Timeline

Timeline From EPO dates

1979198119831985198719891991199319951997Application filedNov 17, 1978PublishedMay 30, 1979Patent grantedSep 16, 1981Term endedNov 17, 1998

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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