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Expired European patentEurope

Method for purification and concentration of MgCl2-brines

EP 0038381 B1 · Applicant: NORSK HYDRO A/S

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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 22, 1980 and granted April 18, 1984. A European patent lasts at most 20 years from filing, so its term ended August 22, 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 February 22, 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.
FiledAugust 22, 1980
PublishedOctober 28, 1981
GrantedApril 18, 1984
Term endedAugust 22, 2000
Application numberEP 80200797
Classification (CPC)C01F5/30

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedAug 22, 1980PublishedOct 28, 1981Patent grantedApril 18, 1984Term endedAug 22, 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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