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Expired European patentEurope

Process for the removal of silica from an alkaline solution containing sodium aluminate

EP 1087908 B1 · Applicant: ALCAN INTERNATIONAL LIMITED

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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 June 18, 1999 and granted May 2, 2002. A European patent lasts at most 20 years from filing, so its term ended June 18, 2019.
  • 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 December 18, 2024.
  • 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.
FiledJune 18, 1999
PublishedApril 4, 2001
GrantedMay 2, 2002
Term endedJune 18, 2019
Application numberEP 99927616
Classification (CPC)C01F7/47 +1 more

Timeline

Timeline From EPO dates

2000200220042006200820102012201420162018Application filedJune 18, 1999PublishedApril 4, 2001Patent grantedMay 2, 2002Term endedJune 18, 2019

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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