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Expired European patentEurope

Method for recovering platinum in a nitric acid plant

EP 0077121 B1 · Applicant: ENGELHARD CORPORATION

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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 August 6, 1982 and granted May 10, 1989. A European patent lasts at most 20 years from filing, so its term ended August 6, 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 February 6, 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.
FiledAugust 6, 1982
PublishedApril 20, 1983
GrantedMay 10, 1989
Term endedAugust 6, 2002
Application numberEP 82304173
Classification (CPC)C22B7/001 +2 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedAug 6, 1982PublishedApril 20, 1983Patent grantedMay 10, 1989Term endedAug 6, 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

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