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Expired European patentEurope

Use of blends of mannich acrylamide polymers and dimethyldiallylammonium halide polymers for flocculating enzyme broth streams

EP 0448926 B1 · Applicant: CYTEC TECHNOLOGY CORP.

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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 January 11, 1991 and granted November 29, 1995. A European patent lasts at most 20 years from filing, so its term ended January 11, 2011.
  • 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 11, 2016.
  • 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.
FiledJanuary 11, 1991
PublishedOctober 2, 1991
GrantedNovember 29, 1995
Term endedJanuary 11, 2011
Application numberEP 91100312
Classification (CPC)C12N9/50

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedJan 11, 1991PublishedOct 2, 1991Patent grantedNov 29, 1995Term endedJan 11, 2011

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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