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Expired European patentEurope

Apparatus and method for echo attenuation

EP 0665671 B1 · Applicant: NOKIA MOBILE PHONES LTD.

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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 December 23, 1994 and granted March 31, 2004. A European patent lasts at most 20 years from filing, so its term ended December 23, 2014.
  • 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 June 23, 2020.
  • 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.
FiledDecember 23, 1994
PublishedAugust 2, 1995
GrantedMarch 31, 2004
Term endedDecember 23, 2014
Application numberEP 94309807
Classification (CPC)H04M9/08

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedDec 23, 1994PublishedAug 2, 1995Patent grantedMarch 31, 2004Term endedDec 23, 2014

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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