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Expired European patentEurope

Process for purifying brominated polystyrene

EP 0520007 B1 · Applicant: GREAT LAKES CHEMICAL CORPORATION

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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 March 12, 1991 and granted June 3, 1998. A European patent lasts at most 20 years from filing, so its term ended March 12, 2011.
  • 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 September 12, 2016.
  • 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.
FiledMarch 12, 1991
PublishedJune 3, 1998
GrantedJune 3, 1998
Term endedMarch 12, 2011
Application numberEP 91906520
Classification (CPC)C08F6/24 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMarch 12, 1991PublishedJune 3, 1998Patent grantedJune 3, 1998Term endedMarch 12, 2011

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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