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Expired European patentEurope

Process for toning image-wise modified surfaces

EP 0109293 B1 · Applicant: E.I. DU PONT DE NEMOURS AND COMPANY

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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 11, 1983 and granted March 25, 1987. A European patent lasts at most 20 years from filing, so its term ended November 11, 2003.
  • 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 11, 2009.
  • 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 11, 1983
PublishedMay 23, 1984
GrantedMarch 25, 1987
Term endedNovember 11, 2003
Application numberEP 83306922
Classification (CPC)G03F7/28

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedNov 11, 1983PublishedMay 23, 1984Patent grantedMarch 25, 1987Term endedNov 11, 2003

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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