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Expired European patentEurope

Deactivation of aluminum alkyls

EP 0290474 B1 · Applicant: Aristech Chemical 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 February 13, 1987 and granted August 29, 1990. A European patent lasts at most 20 years from filing, so its term ended February 13, 2007.
  • 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 August 13, 2012.
  • 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.
FiledFebruary 13, 1987
PublishedNovember 17, 1988
GrantedAugust 29, 1990
Term endedFebruary 13, 2007
Application numberEP 87901874
Classification (CPC)C08F6/02

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedFeb 13, 1987PublishedNov 17, 1988Patent grantedAug 29, 1990Term endedFeb 13, 2007

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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