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European application, no grantEurope

Current-steering digital-to-analog converter for providing bi-directional currents through a load

EP 0277177 A1 · Applicant: HALLGREN, Robert B.

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Overview

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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 July 24, 1987 and never granted as a European patent. Had it been granted, its 20-year term would have ended July 24, 2007.
  • 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 January 24, 2013.
  • 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.
FiledJuly 24, 1987
PublishedAugust 10, 1988
GrantedNever granted
Term endedJuly 24, 2007
Application numberEP 87905123
Classification (CPC)H03M1/0682

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedJuly 24, 1987PublishedAug 10, 1988Term endedJuly 24, 2007

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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