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Expired European patentEurope

Aluminium sulphate composition for water-purifying, paper-sizing and plant dewatering purposes and a method for producing the composition

EP 0062015 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 March 12, 1982 and granted June 16, 1987. A European patent lasts at most 20 years from filing, so its term ended March 12, 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 September 12, 2007.
  • 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.
FiledMarch 12, 1982
PublishedOctober 6, 1982
GrantedJune 16, 1987
Term endedMarch 12, 2002
Application numberEP 82850050
Classification (CPC)C01F7/74 +2 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedMarch 12, 1982PublishedOct 6, 1982Patent grantedJune 16, 1987Term endedMarch 12, 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

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