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Expired European patentEurope

Travelling-wave tube with a coupling arrangement between its delay line and external microwave circuits

EP 0341107 B1 · Applicant: THOMSON-CSF

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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 April 14, 1989 and granted March 11, 1992. A European patent lasts at most 20 years from filing, so its term ended April 14, 2009.
  • 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 October 14, 2014.
  • 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.
FiledApril 14, 1989
PublishedNovember 8, 1989
GrantedMarch 11, 1992
Term endedApril 14, 2009
Application numberEP 89401031
Classification (CPC)H01J23/50

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedApril 14, 1989PublishedNov 8, 1989Patent grantedMarch 11, 1992Term endedApril 14, 2009

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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