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Expired European patentEurope

Polybutylene succinimide as adjuvant for electrostatic liquid developer

EP 0244725 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 April 25, 1987 and granted March 11, 1992. A European patent lasts at most 20 years from filing, so its term ended April 25, 2007.
  • 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 25, 2012.
  • 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 25, 1987
PublishedNovember 11, 1987
GrantedMarch 11, 1992
Term endedApril 25, 2007
Application numberEP 87106071
Classification (CPC)G03G9/135 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedApril 25, 1987PublishedNov 11, 1987Patent grantedMarch 11, 1992Term endedApril 25, 2007

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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