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Expired European patentEurope

A method and an apparatus for evaluating the gas purifying ability of a gas purifier

EP 0330175 B1 · Applicant: KABUSHIKI KAISHA TOSHIBA

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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 February 22, 1989 and granted August 18, 1993. A European patent lasts at most 20 years from filing, so its term ended February 22, 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 August 22, 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.
FiledFebruary 22, 1989
PublishedAugust 30, 1989
GrantedAugust 18, 1993
Term endedFebruary 22, 2009
Application numberEP 89103084
Classification (CPC)G01N5/02 +1 more

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

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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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