Electrochemically treated photo-lithographic plates

Details Electrochemically treated photo-lithographic plates Electrochemically treated photo-lithographic plates

1977-11-21

1979-05-01

Bowers, Jr., Charles L.

Gas separation: apparatus

Electric field separation apparatus

Plural diverse electric fields

96 33, 96 86P, 148 627, 204 33, 204 38A, 204 42, G03C 194, C23F 700, C25D 1112

Patent

active

041521587

ABSTRACT:
There are disclosed herein lithographic plates having an aluminum base the surface of which has been made porous and hardened first by an alternating current anodization in a hydrochloric acid electrolyte and then by a direct current anodization in a sulfuric acid electrolyte.

REFERENCES:
patent: 2126017 (1938-08-01), Jenny et al.
patent: 3136639 (1964-06-01), Deal et al.
patent: 3181461 (1965-05-01), Fromson
patent: 3280734 (1966-10-01), Fromson
patent: 3330743 (1967-07-01), Jestl et al.
patent: 3440050 (1969-04-01), Chu

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