Patent Yard Sign in
Expired European patentEurope

Process for the detoxification of effluents from ore processing operations with hydrogen peroxide, using a magnetic pre-separation stage

EP 0339230 B1 · Applicant: DEGUSSA AKTIENGESELLSCHAFT

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed March 14, 1989 and granted October 16, 1991. A European patent lasts at most 20 years from filing, so its term ended March 14, 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 14, 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 14, 1989
PublishedNovember 2, 1989
GrantedOctober 16, 1991
Term endedMarch 14, 2009
Application numberEP 89104501
Classification (CPC)C22B11/08 +2 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedMarch 14, 1989PublishedNov 2, 1989Patent grantedOct 16, 1991Term endedMarch 14, 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

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