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Expired European patentEurope

Process for preparing linear trans-quinacridone in gamma-crystal modification

EP 0001613 B1 · Applicant: HOECHST AKTIENGESELLSCHAFT

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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 October 11, 1978 and granted September 29, 1982. A European patent lasts at most 20 years from filing, so its term ended October 11, 1998.
  • 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 April 11, 2004.
  • 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.
FiledOctober 11, 1978
PublishedMay 2, 1979
GrantedSeptember 29, 1982
Term endedOctober 11, 1998
Application numberEP 78101120
Classification (CPC)C09B48/00

Timeline

Timeline From EPO dates

1979198119831985198719891991199319951997Application filedOct 11, 1978PublishedMay 2, 1979Patent grantedSep 29, 1982Term endedOct 11, 1998

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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