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Expired European patentEurope

P-tert.-butylbenzal bromide and its derivatives substituted in the nucleus by halogen

EP 0034837 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 November 13, 1979 and granted December 15, 1982. A European patent lasts at most 20 years from filing, so its term ended November 13, 1999.
  • 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 May 13, 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.
FiledNovember 13, 1979
PublishedSeptember 2, 1981
GrantedDecember 15, 1982
Term endedNovember 13, 1999
Application numberEP 81102900
Classification (CPC)C07C25/02 +2 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedNov 13, 1979PublishedSep 2, 1981Patent grantedDec 15, 1982Term endedNov 13, 1999

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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