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Expired European patentEurope

Process for controlling the respiration activity of microorganisms in an activated sludge process in waste water treatment

EP 0656323 B1 · Applicant: Albert, Alfred

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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 November 8, 1994 and granted February 20, 2002. A European patent lasts at most 20 years from filing, so its term ended November 8, 2014.
  • 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 May 8, 2020.
  • 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.
FiledNovember 8, 1994
PublishedJune 7, 1995
GrantedFebruary 20, 2002
Term endedNovember 8, 2014
Application numberEP 94117617
Classification (CPC)C02F3/34 +2 more

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedNov 8, 1994PublishedJune 7, 1995Patent grantedFeb 20, 2002Term endedNov 8, 2014

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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