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Expired European patentEurope

Calibration apparatus for systems such as analog to digital converters

EP 0142298 B1 · Applicant: JOHN FLUKE MFG. CO., INC.

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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 22, 1984 and granted December 5, 1990. A European patent lasts at most 20 years from filing, so its term ended October 22, 2004.
  • 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 22, 2010.
  • 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 22, 1984
PublishedMay 22, 1985
GrantedDecember 5, 1990
Term endedOctober 22, 2004
Application numberEP 84307269
Classification (CPC)H03M1/069

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedOct 22, 1984PublishedMay 22, 1985Patent grantedDec 5, 1990Term endedOct 22, 2004

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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