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Expired European patentEurope

Process for the biological denitrification of waste water

EP 0075297 B1 · Applicant: Linde 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 September 17, 1982 and granted July 16, 1986. A European patent lasts at most 20 years from filing, so its term ended September 17, 2002.
  • 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 March 17, 2008.
  • 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.
FiledSeptember 17, 1982
PublishedMarch 30, 1983
GrantedJuly 16, 1986
Term endedSeptember 17, 2002
Application numberEP 82108610
Classification (CPC)C02F3/2806 +2 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedSep 17, 1982PublishedMarch 30, 1983Patent grantedJuly 16, 1986Term endedSep 17, 2002

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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