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Expired European patentEurope

Binary multiplier with sign extension for the multiplication of signed and unsigned numbers

EP 0128072 B1 · Applicant: SOCIETE POUR L'ETUDE ET LA FABRICATION DE CIRCUITS INTEGRES SPECIAUX - E.F.C.I.S.

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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 May 15, 1984 and granted March 18, 1987. A European patent lasts at most 20 years from filing, so its term ended May 15, 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 November 15, 2009.
  • 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.
FiledMay 15, 1984
PublishedDecember 12, 1984
GrantedMarch 18, 1987
Term endedMay 15, 2004
Application numberEP 84400987
Classification (CPC)G06F7/5312

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMay 15, 1984PublishedDec 12, 1984Patent grantedMarch 18, 1987Term endedMay 15, 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

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