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European application, no grantEurope

Substituted acylating agents and their production

EP 0457599 A2 · Applicant: ETHYL PETROLEUM ADDITIVES, INC.

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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 May 17, 1991 and never granted as a European patent. Had it been granted, its 20-year term would have ended May 17, 2011.
  • 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 November 17, 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.
FiledMay 17, 1991
PublishedNovember 21, 1991
GrantedNever granted
Term endedMay 17, 2011
Application numberEP 91304437
Classification (CPC)C07C51/567 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMay 17, 1991PublishedNov 21, 1991Term endedMay 17, 2011

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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