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Expired European patentEurope

Method and apparatus for direct reduction of metal oxides

EP 0442040 B1 · Applicant: ZIA TECHNOLOGY, INC.

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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 October 29, 1990 and granted January 2, 1997. A European patent lasts at most 20 years from filing, so its term ended October 29, 2010.
  • 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 April 29, 2016.
  • 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.
FiledOctober 29, 1990
PublishedAugust 21, 1991
GrantedJanuary 2, 1997
Term endedOctober 29, 2010
Application numberEP 90120732
Classification (CPC)F27B7/2083

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedOct 29, 1990PublishedAug 21, 1991Patent grantedJan 2, 1997Term endedOct 29, 2010

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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