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Expired European patentEurope

A method of producing an aluminium-sulphate solution

EP 0018339 B1 · Applicant: Boliden Aktiebolag

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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 April 10, 1980 and granted August 1, 1984. A European patent lasts at most 20 years from filing, so its term ended April 10, 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 October 10, 2005.
  • 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.
FiledApril 10, 1980
PublishedOctober 29, 1980
GrantedAugust 1, 1984
Term endedApril 10, 2000
Application numberEP 80850050
Classification (CPC)C01F7/74 +1 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedApril 10, 1980PublishedOct 29, 1980Patent grantedAug 1, 1984Term endedApril 10, 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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