Patent · US Expired

Method of blackening steel components for cathode ray tubes

US4357367A · kind A · utility

0Cited by

2References

4Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Albert Comberg · Aachen, DE
Karl H. Panstruga · Aachen, DE

Key dates

Filing date	Mar 20, 1981
Grant date	Nov 2, 1982
Priority date	—
Expiry date	Mar 20, 2001

Classification

Technology area (CPC H)Electricity
CPC primaryH01J9/146
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An adhering bismuth layer is provided on steel components for cathode ray tubes by electroless plating in an acidic aqueous solution of bismuth oxynitrate. The bismuth coated steel components are heated in an oxidizing atmosphere, for example in air, at temperatures between 350.degree. C. and 650.degree. C. until the bismuth coating becomes black.

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