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Expired European patentEurope

Audio channel stacking with speech compression for narrow band transmission with provision for dialed calls

EP 0155285 B1 · Applicant: The Variable Speech Control Company ("VSC")

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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 August 14, 1984 and granted December 27, 1991. A European patent lasts at most 20 years from filing, so its term ended August 14, 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 February 14, 2010.
  • 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.
FiledAugust 14, 1984
PublishedSeptember 25, 1985
GrantedDecember 27, 1991
Term endedAugust 14, 2004
Application numberEP 84903251
Classification (CPC)H04B1/66 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedAug 14, 1984PublishedSep 25, 1985Patent grantedDec 27, 1991Term endedAug 14, 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.