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Expired European patentEurope

Monitoring film fouling in a process stream

EP 0531067 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 August 28, 1992 and granted December 27, 1995. A European patent lasts at most 20 years from filing, so its term ended August 28, 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 February 28, 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.
FiledAugust 28, 1992
PublishedMarch 10, 1993
GrantedDecember 27, 1995
Term endedAugust 28, 2012
Application numberEP 92307865
Classification (CPC)G01B11/0616

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedAug 28, 1992PublishedMarch 10, 1993Patent grantedDec 27, 1995Term endedAug 28, 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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