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Expired European patentEurope

The use of alkenyl succinic anhydride compounds derived from symmetrical olefins in internal sizing for paper production

EP 1869249 B1 · Applicant: Nalco Company

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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 14, 2006 and granted March 12, 2014. A European patent lasts at most 20 years from filing, so its term ended April 14, 2026.
  • Supplementary protection certificates extend only medicine and crop-protection patents, and it isn't classified as either.
  • 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 14, 2006
PublishedDecember 26, 2007
GrantedMarch 12, 2014
Term endedApril 14, 2026
Application numberEP 06750297
Classification (CPC)D21H21/16

Timeline

Timeline From EPO dates

2007200920112013201520172019202120232025Application filedApril 14, 2006PublishedDec 26, 2007Patent grantedMarch 12, 2014Term endedApril 14, 2026

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

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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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