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Expired European patentEurope

A method of calibrating and equalizing a multi-chanel automatic gain control amplifier

EP 0252089 B1 · Applicant: Hughes Aircraft Company

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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 September 22, 1986 and granted February 5, 1992. A European patent lasts at most 20 years from filing, so its term ended September 22, 2006.
  • 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 March 22, 2012.
  • 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.
FiledSeptember 22, 1986
PublishedJanuary 13, 1988
GrantedFebruary 5, 1992
Term endedSeptember 22, 2006
Application numberEP 86906139
Classification (CPC)G01S7/4021 +2 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedSep 22, 1986PublishedJan 13, 1988Patent grantedFeb 5, 1992Term endedSep 22, 2006

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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