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Expired European patentEurope

Benzoxazolyl stilbenes, process for their preparation and their use as optical brighteners for organic materials

EP 0020298 B1 · Applicant: CIBA-GEIGY 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 May 12, 1980 and granted June 22, 1983. A European patent lasts at most 20 years from filing, so its term ended May 12, 2000.
  • 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 November 12, 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.
FiledMay 12, 1980
PublishedDecember 10, 1980
GrantedJune 22, 1983
Term endedMay 12, 2000
Application numberEP 80810161
Classification (CPC)C07D239/26 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedMay 12, 1980PublishedDec 10, 1980Patent grantedJune 22, 1983Term endedMay 12, 2000

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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