Patent · US Expired

Method of manufacturing a display tube

US5360361A · kind A · utility

4Cited by

2References

14Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Helmut Bechtel · Aachen, DE
Wolfram Czarnojan · Aachen, DE
Stefan Willi Julius Gruhlke · Baesweiler, DE
Ulrich Kynast · Roetgen, DE

Key dates

Filing date	Jul 16, 1993
Grant date	Nov 1, 1994
Priority date	—
Expiry date	Jul 16, 2013

Classification

Technology area (CPC H)Electricity
CPC primaryH01J9/38
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The luminescent phosphor degradation in a cathode ray display tube, caused by aging, is decreased. This decrease is achieved by introducing before and/or during evacuation a hydrolyzable gas into the tube's inner space for a limited time interval, using a partial pressure which is essentially larger than the eventual final vacuum pressure of the cathode ray tube, and then allowing the final vacuum pressure to be achieved without any further supply of gas. Thereafter, the cathode ray tube is sealed in a gastight manner.

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