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Expired European patentEurope

Method of treating waste waters

EP 0056068 B1 · Applicant: Henkel Kommanditgesellschaft auf Aktien

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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 14, 1981 and granted July 17, 1985. A European patent lasts at most 20 years from filing, so its term ended January 14, 2001.
  • 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 14, 2006.
  • 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 14, 1981
PublishedJuly 21, 1982
GrantedJuly 17, 1985
Term endedJanuary 14, 2001
Application numberEP 81100240
Classification (CPC)C02F1/5236

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedJan 14, 1981PublishedJuly 21, 1982Patent grantedJuly 17, 1985Term endedJan 14, 2001

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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