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Expired European patentEurope

Process for preparation of organic acid halide

EP 0002989 B1 · Applicant: ETHYL CORPORATION

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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 December 21, 1978 and granted October 21, 1981. A European patent lasts at most 20 years from filing, so its term ended December 21, 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 June 21, 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.
FiledDecember 21, 1978
PublishedJuly 11, 1979
GrantedOctober 21, 1981
Term endedDecember 21, 1998
Application numberEP 78400254
Classification (CPC)C07C51/60

Timeline

Timeline From EPO dates

1979198119831985198719891991199319951997Application filedDec 21, 1978PublishedJuly 11, 1979Patent grantedOct 21, 1981Term endedDec 21, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.