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Expired European patentEurope

Colour developer composition

EP 0518471 B1 · Applicant: The Wiggins Teape Group Limited

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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 April 28, 1992 and granted December 7, 1994. A European patent lasts at most 20 years from filing, so its term ended April 28, 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 October 28, 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.
FiledApril 28, 1992
PublishedDecember 16, 1992
GrantedDecember 7, 1994
Term endedApril 28, 2012
Application numberEP 92303834
Classification (CPC)B41M5/1555

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedApril 28, 1992PublishedDec 16, 1992Patent grantedDec 7, 1994Term endedApril 28, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.