Patent Yard Sign in
Expired European patentEurope

Procedure for production of chlorine dioxide

EP 0445142 B1 · Applicant: EKA NOBEL AB

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 November 21, 1989 and granted February 3, 1993. A European patent lasts at most 20 years from filing, so its term ended November 21, 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 May 21, 2015.
  • 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.
FiledNovember 21, 1989
PublishedSeptember 11, 1991
GrantedFebruary 3, 1993
Term endedNovember 21, 2009
Application numberEP 89912675
Classification (CPC)C01B11/023

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedNov 21, 1989PublishedSep 11, 1991Patent grantedFeb 3, 1993Term endedNov 21, 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.