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Expired European patentEurope

Process for producing colour change devices incorporating latent indicia and the resulting devices

EP 0526480 B1 · Applicant: ALCAN INTERNATIONAL LIMITED

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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 April 3, 1991 and granted August 10, 1994. A European patent lasts at most 20 years from filing, so its term ended April 3, 2011.
  • 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 3, 2016.
  • 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 3, 1991
PublishedFebruary 10, 1993
GrantedAugust 10, 1994
Term endedApril 3, 2011
Application numberEP 91907216
Classification (CPC)C25D11/26 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 3, 1991PublishedFeb 10, 1993Patent grantedAug 10, 1994Term endedApril 3, 2011

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.