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Expired European patentEurope

Process for the purification of wastewater containing high concentration of ammonium ion

EP 0335280 B1 · Applicant: Yawari, Touraj, Dipl.-Ing.

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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 March 24, 1989 and granted September 11, 1991. A European patent lasts at most 20 years from filing, so its term ended March 24, 2009.
  • 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 September 24, 2014.
  • 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.
FiledMarch 24, 1989
PublishedOctober 4, 1989
GrantedSeptember 11, 1991
Term endedMarch 24, 2009
Application numberEP 89105321
Classification (CPC)C02F1/586 +2 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedMarch 24, 1989PublishedOct 4, 1989Patent grantedSep 11, 1991Term endedMarch 24, 2009

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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