Method of controlled etching in the manufacture of a color selec

Details Method of controlled etching in the manufacture of a color selec Method of controlled etching in the manufacture of a color selec

1974-10-07

1976-11-23

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

96 361, 156 6, 156 11, 156 18, H01J 920

Patent

active

039935167

ABSTRACT:
A method of forming a pattern of electron-transmissive apertures in a color selection mask for a color cathode ray tube. The method includes providing an electrically conductive preformed blank comprising a relatively thin aperture-defining layer on a relatively thick substrate layer; establishing a first etchant-resistant structure on the aperture-defining layer; etching through the blank to form preliminary sized and shaped apertures in the aperture-defining layer; establishing a second etchant-resistant structure on the aperture-defining layer; etching the aperture-defining layer forming ultimate apertures in the aperture-defining layer; and stripping the etchant-resistant structure from the aperture-defining layer.

REFERENCES:
patent: 3423261 (1969-01-01), Frantzen
patent: 3661581 (1972-05-01), Feldstein
patent: 3725065 (1973-04-01), Fadner
patent: 3730719 (1973-05-01), Law
patent: 3788846 (1974-01-01), Mayaud et al.

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