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Expired European patentEurope

Process for the manufacture of perylene-3,4,9,10-tetracarboxylic acid diimides in a pigmentary form with a high tinctorial value

EP 0446472 B1 · Applicant: BAYER AG

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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, 1990 and granted June 8, 1994. A European patent lasts at most 20 years from filing, so its term ended December 20, 2010.
  • 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, 2016.
  • 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, 1990
PublishedSeptember 18, 1991
GrantedJune 8, 1994
Term endedDecember 20, 2010
Application numberEP 90124999
Classification (CPC)C09B67/0014

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedDec 20, 1990PublishedSep 18, 1991Patent grantedJune 8, 1994Term endedDec 20, 2010

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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