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Expired European patentEurope

Feedback circuit regulating the control voltage depending on the temperature in a travelling wave tube

EP 0121189 B1 · Applicant: SIEMENS AKTIENGESELLSCHAFT

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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 March 22, 1984 and granted June 24, 1987. A European patent lasts at most 20 years from filing, so its term ended March 22, 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 September 22, 2009.
  • 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 22, 1984
PublishedOctober 10, 1984
GrantedJune 24, 1987
Term endedMarch 22, 2004
Application numberEP 84103197
Classification (CPC)H01J23/34 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMarch 22, 1984PublishedOct 10, 1984Patent grantedJune 24, 1987Term endedMarch 22, 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.