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Expired European patentEurope

Aqueous solution or dispersion of a styrene-maleic acid anhydride copolymer, process for its preparation and its use

EP 0025979 B1 · Applicant: HOECHST 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 September 18, 1980 and granted May 25, 1983. A European patent lasts at most 20 years from filing, so its term ended September 18, 2000.
  • 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 March 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.
FiledSeptember 18, 1980
PublishedApril 1, 1981
GrantedMay 25, 1983
Term endedSeptember 18, 2000
Application numberEP 80105591
Classification (CPC)C08F8/44

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedSep 18, 1980PublishedApril 1, 1981Patent grantedMay 25, 1983Term endedSep 18, 2000

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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