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Expired European patentEurope

Process for the preparation of modified polyisocyanates containing sulphonic acid alkylester groups and their use for the preparation of polyaddition products

EP 0003097 B1 · Applicant: BAYER AG

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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 January 2, 1979 and granted July 23, 1980. A European patent lasts at most 20 years from filing, so its term ended January 2, 1999.
  • 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 2, 2004.
  • 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 2, 1979
PublishedJuly 25, 1979
GrantedJuly 23, 1980
Term endedJanuary 2, 1999
Application numberEP 79100003
Classification (CPC)C08G18/775

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedJan 2, 1979PublishedJuly 25, 1979Patent grantedJuly 23, 1980Term endedJan 2, 1999

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.