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Expired European patentEurope

Improvements relating to frequency modulation detectors

EP 0143556 B1 · Applicant: PLESSEY OVERSEAS LIMITED

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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 October 29, 1984 and granted August 16, 1990. A European patent lasts at most 20 years from filing, so its term ended October 29, 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 April 29, 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.
FiledOctober 29, 1984
PublishedJune 5, 1985
GrantedAugust 16, 1990
Term endedOctober 29, 2004
Application numberEP 84307428
Classification (CPC)H03D3/00

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedOct 29, 1984PublishedJune 5, 1985Patent grantedAug 16, 1990Term endedOct 29, 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

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