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European application, no grantEurope

A rotary developer and method for its use

EP 0341374 A2 · Applicant: E.I. DU PONT DE NEMOURS AND COMPANY

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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 January 31, 1989 and never granted as a European patent. Had it been granted, its 20-year term would have ended January 31, 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 July 31, 2014.
  • 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.
FiledJanuary 31, 1989
PublishedNovember 15, 1989
GrantedNever granted
Term endedJanuary 31, 2009
Application numberEP 89101611
Classification (CPC)G03F7/3021

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedJan 31, 1989PublishedNov 15, 1989Term endedJan 31, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.