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Expired European patentEurope

Process for controlling pearl dimensions in the preparation of expandable styrene polymers by suspension polymerization

EP 0143880 B1 · Applicant: HÜLS AKTIENGESELLSCHAFT

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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 July 3, 1984 and granted February 1, 1989. A European patent lasts at most 20 years from filing, so its term ended July 3, 2004.
  • 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 January 3, 2010.
  • 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.
FiledJuly 3, 1984
PublishedJune 12, 1985
GrantedFebruary 1, 1989
Term endedJuly 3, 2004
Application numberEP 84107707
Classification (CPC)C08J9/20

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedJuly 3, 1984PublishedJune 12, 1985Patent grantedFeb 1, 1989Term endedJuly 3, 2004

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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