Apparatus for forming apertures in a thin metal tape such as a s

Details Apparatus for forming apertures in a thin metal tape such as a s Apparatus for forming apertures in a thin metal tape such as a s

1975-09-29

1978-01-17

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Differential fluid etching apparatus

With microwave gas energizing means

156290, 156631, 156640, 156661, 156664, C23F 102

Patent

active

040690857

ABSTRACT:
A method of forming apertures in a thin metal tape. Cavities having a depth of at least half of the tape thickness are first etched from one side. Etching is then carried out mainly from the other side until apertures having the desired profile have been formed. During etching the first-mentioned side, the said other side is covered with a foil of synthetic resin. Shadow mask for a color television display tube manufactured according to a similar method.

REFERENCES:
patent: 1971697 (1934-08-01), Schieren
patent: 2052962 (1936-09-01), Booe
patent: 3197324 (1965-07-01), Brooks
patent: 3359192 (1967-12-01), Heinrich et al.
patent: 3635730 (1972-01-01), Sweltzer
patent: 3799792 (1974-03-01), Ryng
patent: 3808071 (1974-04-01), Lerner
patent: 3809011 (1974-05-01), Fabre et al.
patent: 3866565 (1975-02-01), Ridout
patent: 3885520 (1975-05-01), Krumme
patent: 3888745 (1975-06-01), Hoyjo

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