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Expired European patentEurope

Synergistic, additive or antagonistic product selection test for biocides

EP 0505023 B1 · Applicant: NALCO CHEMICAL 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 January 10, 1992 and granted August 21, 1996. A European patent lasts at most 20 years from filing, so its term ended January 10, 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 10, 2017.
  • 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 10, 1992
PublishedSeptember 23, 1992
GrantedAugust 21, 1996
Term endedJanuary 10, 2012
Application numberEP 92300216
Classification (CPC)C12Q1/18

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedJan 10, 1992PublishedSep 23, 1992Patent grantedAug 21, 1996Term endedJan 10, 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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