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Expired European patentEurope

Process for treating leaching tailings obtained during the preparation of titanium dioxide

EP 0031064 B1 · Applicant: BAYER AG

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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 December 6, 1980 and granted July 20, 1983. A European patent lasts at most 20 years from filing, so its term ended December 6, 2000.
  • 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 June 6, 2006.
  • 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.
FiledDecember 6, 1980
PublishedJuly 1, 1981
GrantedJuly 20, 1983
Term endedDecember 6, 2000
Application numberEP 80107700
Classification (CPC)C22B34/125

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedDec 6, 1980PublishedJuly 1, 1981Patent grantedJuly 20, 1983Term endedDec 6, 2000

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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