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Expired European patentEurope

Process for minimizing pollutant concentrations in combustion gases

EP 0530255 B1 · Applicant: Nalco Fuel Tech GmbH

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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 May 21, 1991 and granted July 10, 1996. A European patent lasts at most 20 years from filing, so its term ended May 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 November 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.
FiledMay 21, 1991
PublishedMarch 10, 1993
GrantedJuly 10, 1996
Term endedMay 21, 2011
Application numberEP 91909743
Classification (CPC)B01D53/56

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMay 21, 1991PublishedMarch 10, 1993Patent grantedJuly 10, 1996Term endedMay 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.