GPI coverage and content

You can use Global Patent Index (GPI) to carry out detailed searches in the EPO's worldwide bibliographic (DOCDB), legal event (INPADOC) and full-text data sets, and download or visualise the search results for statistical analysis.

Current content: 157 484 516 patent documents

This week's update (26/07/2024 12:00 CET):

147 225 new documents added

921 612 documents amended

GPI key values

Run regular monitoring (e.g. monthly or quarterly) of technical areas or companies

Use built-in charts to visualise technical trends and patenting activity of companies

Choose the data you want to see and download to focus on what you are interested in

Run data quality assessments to measure the risk of incomplete search results

EP 0052047 B1 19860108 - THERMOELECTRONIC CATHODE

Title (en)

THERMOELECTRONIC CATHODE

Publication

EP 0052047 B1 19860108 (FR)

Application

EP 81401713 A 19811027

Priority

FR 8023884 A 19801107

Abstract (en)

[origin: US4494035A] This invention concerns a thermoelectronic cathode for hyperfrequency electron tubes. The cathode comprises a cylindrical molybdenum casing, the lower portion of which contains a heating filament, while the upper portion contains two superimposed porous bodies, the lower one made from impregnated material, and the upper one from non-impregnated material.

IPC 1-7

H01J 1/28; H01J 23/04

IPC 8 full level

H01J 23/06 (2006.01); H01J 1/28 (2006.01); H01J 23/04 (2006.01)

CPC (source: EP US)

H01J 1/28 (2013.01 - EP US); H01J 23/04 (2013.01 - EP US)

Designated contracting state (EPC)

DE GB IT NL

DOCDB simple family (publication)

EP 0052047 A1 19820519; EP 0052047 B1 19860108; EP 0052047 B2 19900502; DE 3173470 D1 19860220; FR 2494035 A1 19820514; FR 2494035 B1 19830513; JP S57107534 A 19820705; US 4494035 A 19850115

DOCDB simple family (application)

EP 81401713 A 19811027; DE 3173470 T 19811027; FR 8023884 A 19801107; JP 17731181 A 19811106; US 31831681 A 19811104