Methods of making printed circuit boards utilizing an image tran

Details Methods of making printed circuit boards utilizing an image tran Methods of making printed circuit boards utilizing an image tran

1974-08-02

1976-03-23

Kimlin, Edward C.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 27E, 96 383, 96 452, G03C 500, G03C 532

Patent

active

039458270

ABSTRACT:
The photographic method of producing a printed circuit involves preparing a film negative from a graphic replica of the printed circuit and, through the film negative, exposing a photosensitive coating on a copper laminate board which is then developed and etched. This method is improved using Herschel-effect film in two successive steps, first producing a film image of the graphic printed-circuit replica and then producing the required film negative from the first film image. One of the film images is a film positive and the other is a film negative.

REFERENCES:
patent: 3253918 (1966-05-01), Condax
patent: 3639125 (1972-02-01), Chand
patent: 3642477 (1972-02-01), Trusheim et al.

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