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Expired European patentEurope

Process for the preparation of bi- and/or polyuret-polyisocyanates; products obtained by this process and their use in the preparation of polyurethanes

EP 0012973 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 December 17, 1979 and granted July 15, 1981. A European patent lasts at most 20 years from filing, so its term ended December 17, 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 June 17, 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.
FiledDecember 17, 1979
PublishedJuly 9, 1980
GrantedJuly 15, 1981
Term endedDecember 17, 1999
Application numberEP 79105223
Classification (CPC)C08G18/8038 +2 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedDec 17, 1979PublishedJuly 9, 1980Patent grantedJuly 15, 1981Term endedDec 17, 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.