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Expired European patentEurope

Polymers containing azo dyestuffs

EP 0535490 B1 · Applicant: BASF Aktiengesellschaft

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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 September 21, 1992 and granted June 4, 1997. A European patent lasts at most 20 years from filing, so its term ended September 21, 2012.
  • 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 March 21, 2018.
  • 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.
FiledSeptember 21, 1992
PublishedApril 7, 1993
GrantedJune 4, 1997
Term endedSeptember 21, 2012
Application numberEP 92116096
Classification (CPC)G02F1/3612 +2 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedSep 21, 1992PublishedApril 7, 1993Patent grantedJune 4, 1997Term endedSep 21, 2012

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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