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Expired European patentEurope

Suspensions of aromatic isocyanatosulfonic-acid uretdiones in organic polyisocyanates and process for their preparation

EP 0011784 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 November 16, 1979 and granted March 24, 1982. A European patent lasts at most 20 years from filing, so its term ended November 16, 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 May 16, 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.
FiledNovember 16, 1979
PublishedJune 11, 1980
GrantedMarch 24, 1982
Term endedNovember 16, 1999
Application numberEP 79104540
Classification (CPC)C08G18/775 +2 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedNov 16, 1979PublishedJune 11, 1980Patent grantedMarch 24, 1982Term endedNov 16, 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

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