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Expired European patentEurope

Method and apparatus for the purification of waste water, especially of muddy water resulting from the sludge removal from waters

EP 0267328 B1 · Applicant: Kreyenberg, Heiner, Dipl.-Ing. Dr.

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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 December 13, 1986 and granted February 20, 1991. A European patent lasts at most 20 years from filing, so its term ended December 13, 2006.
  • 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 June 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.
FiledDecember 13, 1986
PublishedMay 18, 1988
GrantedFebruary 20, 1991
Term endedDecember 13, 2006
Application numberEP 86117390
Classification (CPC)B01D36/00 +2 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedDec 13, 1986PublishedMay 18, 1988Patent grantedFeb 20, 1991Term endedDec 13, 2006

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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