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Expired European patentEurope

Pyrazoline optical brighteners, their preparation and their use for treating polyacrylonitrile and wool

EP 0002461 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 25, 1978 and granted July 23, 1980. A European patent lasts at most 20 years from filing, so its term ended November 25, 1998.
  • 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 25, 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.
FiledNovember 25, 1978
PublishedJune 27, 1979
GrantedJuly 23, 1980
Term endedNovember 25, 1998
Application numberEP 78101458
Classification (CPC)C07D231/06

Timeline

Timeline From EPO dates

1979198119831985198719891991199319951997Application filedNov 25, 1978PublishedJune 27, 1979Patent grantedJuly 23, 1980Term endedNov 25, 1998

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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