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Expired European patentEurope

A reference electrode and a measuring apparatus using the same

EP 0304933 B1 · Applicant: NEW OJI PAPER CO., LTD.

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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 26, 1988 and granted December 11, 1996. A European patent lasts at most 20 years from filing, so its term ended August 26, 2008.
  • 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 26, 2014.
  • 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 26, 1988
PublishedMarch 1, 1989
GrantedDecember 11, 1996
Term endedAugust 26, 2008
Application numberEP 88113955
Classification (CPC)G01N27/301

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedAug 26, 1988PublishedMarch 1, 1989Patent grantedDec 11, 1996Term endedAug 26, 2008

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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