Patent Yard Sign in
Expired European patentEurope

Frequency-dependent numerical control circuit

EP 0055146 B1 · Applicant: SOCIETE POUR L'ETUDE ET LA FABRICATION DE CIRCUITS INTEGRES SPECIAUX - E.F.C.I.S.

EPO PDF

Overview

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

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed October 27, 1981 and granted August 14, 1985. A European patent lasts at most 20 years from filing, so its term ended October 27, 2001.
  • 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 27, 2007.
  • 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 27, 1981
PublishedJune 30, 1982
GrantedAugust 14, 1985
Term endedOctober 27, 2001
Application numberEP 81401714
Classification (CPC)H02P23/22

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedOct 27, 1981PublishedJune 30, 1982Patent grantedAug 14, 1985Term endedOct 27, 2001

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.