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Expired European patentEurope

Method of producing a constant reference potential and of measuring the pH-value and pH-meter for analytical chemistry

EP 0399101 B1 · Applicant: Neukum, Alfred

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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 October 27, 1989 and granted August 23, 1995. A European patent lasts at most 20 years from filing, so its term ended October 27, 2009.
  • 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 April 27, 2015.
  • 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.
FiledOctober 27, 1989
PublishedNovember 28, 1990
GrantedAugust 23, 1995
Term endedOctober 27, 2009
Application numberEP 89119963
Classification (CPC)G01N27/301

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedOct 27, 1989PublishedNov 28, 1990Patent grantedAug 23, 1995Term endedOct 27, 2009

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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