Patent · US Expired

Filter arrangement for cathode ray tube

US4247871A · kind A · utility

5Cited by

3References

5Claims

0Family size

Assignee

Nixdorf Computer AG · DE

Inventors

Ulrich Hirsch · Aulendorf, DE
Walter Hardt · Paderborn, DE

Key dates

Filing date	Sep 28, 1978
Grant date	Jan 27, 1981
Priority date	—
Expiry date	Sep 28, 1998

Classification

Technology area (CPC H)Electricity
CPC primaryH01J29/898
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A color filter is placed between the face of a cathode ray tube display unit and a matt black gauze to produce an amber-colored image background. This highlights yellow data characters. The filter is a curved acrylic glass pane either bonded to the tube face in spaced relation or secured thereto by means of a sealing gasket of unique design and construction.

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