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Expired European patentEurope

Method of nitrifying ammonium-nitrogen-containing water and method of treating the same

EP 1721870 B1 · Applicant: Kurita Water Industries Ltd.

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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 9, 2005 and granted June 19, 2019. A European patent lasts at most 20 years from filing, so its term ended February 9, 2025.
  • Supplementary protection certificates extend only medicine and crop-protection patents, and it isn't classified as either.
  • 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 9, 2005
PublishedNovember 15, 2006
GrantedJune 19, 2019
Term endedFebruary 9, 2025
Application numberEP 05709941
Classification (CPC)C02F3/006 +1 more

Timeline

Timeline From EPO dates

2006200820102012201420162018202020222024Application filedFeb 9, 2005PublishedNov 15, 2006Patent grantedJune 19, 2019Term endedFeb 9, 2025

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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