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Expired European patentEurope

Negatively chargeable dry toner composition

EP 0457764 B1 · Applicant: E.I. DU PONT DE NEMOURS AND COMPANY

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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 November 30, 1989 and granted September 27, 1995. A European patent lasts at most 20 years from filing, so its term ended November 30, 2009.
  • 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 30, 2015.
  • 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 30, 1989
PublishedNovember 27, 1991
GrantedSeptember 27, 1995
Term endedNovember 30, 2009
Application numberEP 90900614
Classification (CPC)C08F293/005 +1 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedNov 30, 1989PublishedNov 27, 1991Patent grantedSep 27, 1995Term endedNov 30, 2009

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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