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Expired European patentEurope

Frequency control in single sideband mobile radio systems

EP 0447237 B1 · Applicant: LINEAR MODULATION TECHNOLOGY 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 March 14, 1991 and granted December 11, 1996. A European patent lasts at most 20 years from filing, so its term ended March 14, 2011.
  • 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 September 14, 2016.
  • 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.
FiledMarch 14, 1991
PublishedSeptember 18, 1991
GrantedDecember 11, 1996
Term endedMarch 14, 2011
Application numberEP 91302169
Classification (CPC)H04B1/68

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMarch 14, 1991PublishedSep 18, 1991Patent grantedDec 11, 1996Term endedMarch 14, 2011

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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