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Expired European patentEurope

Process for the preparation of aromatic dicarboxylic acid dichlorides and their use in the preparation of polycondensates

EP 0024286 B1 · Applicant: BAYER AG

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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 June 21, 1980 and granted September 22, 1982. A European patent lasts at most 20 years from filing, so its term ended June 21, 2000.
  • 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 December 21, 2005.
  • 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.
FiledJune 21, 1980
PublishedMarch 4, 1981
GrantedSeptember 22, 1982
Term endedJune 21, 2000
Application numberEP 80103482
Classification (CPC)C07C51/60 +1 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedJune 21, 1980PublishedMarch 4, 1981Patent grantedSep 22, 1982Term endedJune 21, 2000

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.