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Expired European patentEurope

Process for producing a developer having a low metal ion level

EP 0677183 B1 · Applicant: HOECHST CELANESE CORPORATION

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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 December 20, 1993 and granted February 26, 1997. A European patent lasts at most 20 years from filing, so its term ended December 20, 2013.
  • 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 June 20, 2019.
  • 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.
FiledDecember 20, 1993
PublishedOctober 18, 1995
GrantedFebruary 26, 1997
Term endedDecember 20, 2013
Application numberEP 94903683
Classification (CPC)G03F7/32

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedDec 20, 1993PublishedOct 18, 1995Patent grantedFeb 26, 1997Term endedDec 20, 2013

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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