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Expired European patentEurope

Starting-up method for an echo canceller filter, and communication system using this method

EP 0130263 B1 · Applicant: International Business Machines Corporation

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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 June 30, 1983 and granted June 1, 1988. A European patent lasts at most 20 years from filing, so its term ended June 30, 2003.
  • 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 December 30, 2008.
  • 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.
FiledJune 30, 1983
PublishedJanuary 9, 1985
GrantedJune 1, 1988
Term endedJune 30, 2003
Application numberEP 83430023
Classification (CPC)H04B3/238

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedJune 30, 1983PublishedJan 9, 1985Patent grantedJune 1, 1988Term endedJune 30, 2003

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.