Patent · US Expired

Electron gun system

US4891549A · kind A · utility

19Cited by

3References

7Claims

0Family size

Assignee

Nokia Graetz · DE

Inventors

Karl Kniesser · Esslingen am Neckar, DE
Walter Kornaker · Ochsenhausen, DE
Bernhard Lau · Langenau, DE
Werner Schanz · Jeffery Road, DE

Key dates

Filing date	May 20, 1987
Grant date	Jan 2, 1990
Priority date	—
Expiry date	May 20, 2007

Classification

Technology area (CPC H)Electricity
CPC primaryH01J29/503
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The electron gun system of a color picture tube has coined depressions in the area of the apertures for the electron beams in at least one grid electrode, the coined depressions in one side of the grid electrode being concave. Preferably, this is the side of the grid electrode facing the cathode.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.