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Expired European patentEurope

Termination circuit for an r-2r ladder that compensates for temperature drift

EP 0454841 B1 · Applicant: ANALOG DEVICES, INCORPORATED

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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 November 19, 1990 and granted October 22, 1997. A European patent lasts at most 20 years from filing, so its term ended November 19, 2010.
  • 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 May 19, 2016.
  • 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.
FiledNovember 19, 1990
PublishedNovember 6, 1991
GrantedOctober 22, 1997
Term endedNovember 19, 2010
Application numberEP 91901034
Classification (CPC)H03M1/089

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedNov 19, 1990PublishedNov 6, 1991Patent grantedOct 22, 1997Term endedNov 19, 2010

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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