Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1975-03-28
1976-11-09
Weiffenbach, Cameron K.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
29625, 96 362, 156 3, 156 11, 156 16, 156 18, 427264, 427271, 427282, 427287, 427404, B05D 512
Patent
active
039912310
ABSTRACT:
A process or method for producing circuit boards by photo-etching characterized by exposing a first photo-sensitive layer applied to a conductive metal layer on the substrate, removing the unexposed portion of the photo-sensitive layer to expose portions of the metal conductive layer, applying a second metal layer of corrosion-resistant material on the exposed portions of the first metal layer, applying a second photo-sensitive layer, exposing the second photo-sensitive layer using the same mask with the width of the second unexposed pattern, which is an etch-resistant material, being greater than the width of the second metal layer, removing the exposed portions of the second photo-sensitive layer, and etching the first metal layer with a controlled under-etching of the second photo-sensitive layer up to the edges of the second metal layer and then removing the unexposed pattern of photo-sensitive material.
REFERENCES:
patent: 3666549 (1972-05-01), Rhodenizer et al.
patent: 3737314 (1973-06-01), Ruleff et al.
patent: 3775200 (1973-11-01), DE Nobel et al.
Siemens Aktiengesellschaft
Weiffenbach Cameron K.
LandOfFree
Process for the production of circuit boards by a photo-etching does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the production of circuit boards by a photo-etching , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of circuit boards by a photo-etching will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1726320