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Expired European patentEurope

Method and plant for the purification of waste water by the activated sludge method

EP 0869920 B1 · Applicant: KRÜGER A/S

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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 July 14, 1995 and granted November 3, 1999. A European patent lasts at most 20 years from filing, so its term ended July 14, 2015.
  • 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 January 14, 2021.
  • 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.
FiledJuly 14, 1995
PublishedOctober 14, 1998
GrantedNovember 3, 1999
Term endedJuly 14, 2015
Application numberEP 95925750
Classification (CPC)C02F3/30 +2 more

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedJuly 14, 1995PublishedOct 14, 1998Patent grantedNov 3, 1999Term endedJuly 14, 2015

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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