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Expired European patentEurope

Process and equipment for utilizing sewage sludge

EP 0526458 B1 · Applicant: STEAG Aktiengesellschaft

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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 February 21, 1991 and granted July 27, 1994. A European patent lasts at most 20 years from filing, so its term ended February 21, 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 August 21, 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.
FiledFebruary 21, 1991
PublishedFebruary 10, 1993
GrantedJuly 27, 1994
Term endedFebruary 21, 2011
Application numberEP 91904024
Classification (CPC)C02F11/13

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedFeb 21, 1991PublishedFeb 10, 1993Patent grantedJuly 27, 1994Term endedFeb 21, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.