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N,N'-diphenyl-p-phenylene diamines, method for their production and their use as stabilisers for organic materials

EP 0072575 A1 · Applicant: Chemische Werke Lowi GmbH

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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 August 18, 1982 and never granted as a European patent. Had it been granted, its 20-year term would have ended August 18, 2002.
  • 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 February 18, 2008.
  • 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.
FiledAugust 18, 1982
PublishedFebruary 23, 1983
GrantedNever granted
Term endedAugust 18, 2002
Application numberEP 82107546
Classification (CPC)C09K15/18

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedAug 18, 1982PublishedFeb 23, 1983Term endedAug 18, 2002

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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