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Expired European patentEurope

Acidifying composition containing diatomaceous earth

EP 0465629 B1 · Applicant: KEMIRA KEMI AKTIEBOLAG

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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 January 22, 1991 and granted October 13, 1993. A European patent lasts at most 20 years from filing, so its term ended January 22, 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 July 22, 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.
FiledJanuary 22, 1991
PublishedJanuary 15, 1992
GrantedOctober 13, 1993
Term endedJanuary 22, 2011
Application numberEP 91903428
Classification (CPC)A23K30/15 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedJan 22, 1991PublishedJan 15, 1992Patent grantedOct 13, 1993Term endedJan 22, 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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