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A process for the preparation of acrylic polymers having a high water swelling capacity, and their use

EP 0019681 A2 · Applicant: HOECHST AKTIENGESELLSCHAFT

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 January 21, 1980 and never granted as a European patent. Had it been granted, its 20-year term would have ended January 21, 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 July 21, 2005.
  • 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.
FiledJanuary 21, 1980
PublishedDecember 10, 1980
GrantedNever granted
Term endedJanuary 21, 2000
Application numberEP 80100288
Classification (CPC)D06M13/144 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedJan 21, 1980PublishedDec 10, 1980Term endedJan 21, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.