Patent Yard Sign in
Expired European patentEurope

Electron tube with a cylindrical pyrolytic graphite grid

EP 0007865 B1 · Applicant: THOMSON-CSF

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed July 20, 1979 and granted February 3, 1982. A European patent lasts at most 20 years from filing, so its term ended July 20, 1999.
  • 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 January 20, 2005.
  • 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.
FiledJuly 20, 1979
PublishedFebruary 6, 1980
GrantedFebruary 3, 1982
Term endedJuly 20, 1999
Application numberEP 79400518
Classification (CPC)H01J19/38 +1 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedJuly 20, 1979PublishedFeb 6, 1980Patent grantedFeb 3, 1982Term endedJuly 20, 1999

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.