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Expired European patentEurope

Novel cationic polyamines useful as drainage aids and stabilizers for rosin-based sizing agents

EP 0553575 B1 · Applicant: HERCULES INCORPORATED

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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 December 31, 1992 and granted May 15, 1996. A European patent lasts at most 20 years from filing, so its term ended December 31, 2012.
  • 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 July 1, 2018.
  • 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.
FiledDecember 31, 1992
PublishedAugust 4, 1993
GrantedMay 15, 1996
Term endedDecember 31, 2012
Application numberEP 92311892
Classification (CPC)D21H17/62 +2 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedDec 31, 1992PublishedAug 4, 1993Patent grantedMay 15, 1996Term endedDec 31, 2012

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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