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Expired European patentEurope

Process for reducing the residual styrene level of a polystyrene latex

EP 0003957 B1 · Applicant: ISR HOLDING S.A.R.L.

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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 18, 1978 and granted September 29, 1982. A European patent lasts at most 20 years from filing, so its term ended December 18, 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 June 18, 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.
FiledDecember 18, 1978
PublishedSeptember 19, 1979
GrantedSeptember 29, 1982
Term endedDecember 18, 1998
Application numberEP 78300848
Classification (CPC)C08F6/006

Timeline

Timeline From EPO dates

1979198119831985198719891991199319951997Application filedDec 18, 1978PublishedSep 19, 1979Patent grantedSep 29, 1982Term endedDec 18, 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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