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Expired European patentEurope

Use of N-(aminoalkyl)-pyrrolidines as a catalyst for the polyisocyanate-poly-addition process, process for the preparation of polyurethane-ureas

EP 0495249 B1 · Applicant: BAYER AG

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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 30, 1991 and granted July 27, 1994. A European patent lasts at most 20 years from filing, so its term ended December 30, 2011.
  • 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 30, 2017.
  • 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 30, 1991
PublishedJuly 22, 1992
GrantedJuly 27, 1994
Term endedDecember 30, 2011
Application numberEP 91122365
Classification (CPC)C08G18/2018

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedDec 30, 1991PublishedJuly 22, 1992Patent grantedJuly 27, 1994Term endedDec 30, 2011

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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