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Expired European patentEurope

Signal synthesizer

EP 0172425 B1 · Applicant: Hewlett-Packard Company

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 22, 1985 and granted September 12, 1990. A European patent lasts at most 20 years from filing, so its term ended July 22, 2005.
  • 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 22, 2011.
  • 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 22, 1985
PublishedFebruary 26, 1986
GrantedSeptember 12, 1990
Term endedJuly 22, 2005
Application numberEP 85109137
Classification (CPC)H03B21/02

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedJuly 22, 1985PublishedFeb 26, 1986Patent grantedSep 12, 1990Term endedJuly 22, 2005

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.