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Expired European patentEurope

Process for the preparation of graft copolymers from styrene and a rubber polymer

EP 0044233 B1 · Applicant: SOCIETE CHIMIQUE DES CHARBONNAGES SA

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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 June 18, 1981 and granted January 30, 1985. A European patent lasts at most 20 years from filing, so its term ended June 18, 2001.
  • 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 December 18, 2006.
  • 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.
FiledJune 18, 1981
PublishedJanuary 20, 1982
GrantedJanuary 30, 1985
Term endedJune 18, 2001
Application numberEP 81400974
Classification (CPC)C08F255/06

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedJune 18, 1981PublishedJan 20, 1982Patent grantedJan 30, 1985Term endedJune 18, 2001

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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