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Expired European patentEurope

Method for receiving a data signal with double side-band quadrature carrier modulation

EP 0080544 B1 · Applicant: International Business Machines Corporation

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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 November 30, 1981 and granted March 19, 1986. A European patent lasts at most 20 years from filing, so its term ended November 30, 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 May 30, 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.
FiledNovember 30, 1981
PublishedJune 8, 1983
GrantedMarch 19, 1986
Term endedNovember 30, 2001
Application numberEP 81430041
Classification (CPC)H04L27/01

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedNov 30, 1981PublishedJune 8, 1983Patent grantedMarch 19, 1986Term endedNov 30, 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.