Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making electrical device
Reexamination Certificate
2006-02-28
2006-02-28
Barreca, Nicole (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making electrical device
C430S311000, C430S312000, C430S313000, C430S318000, C430S319000
Reexamination Certificate
active
07005241
ABSTRACT:
A process for making a circuit board comprises the following steps of: half-etching a metal layer formed on an insulating substrate by means of a first masking which is positioned on an upper surface of the metal layer; applying a positive liquid resist on the half-etched metal layer from an upper side of the first masking; exposing the positive liquid resist with parallel light from the upper side of the first masking and developing the positive liquid resist in such a manner that a part of the positive liquid resist located under the first masking is protected to be unexposed and undeveloped; etching again the metal layer by means of a second masking composed of the first masking and the protected positive liquid resist to form a conductive pattern on the insulating substrate; and removing the first masking and the second masking from the metal layer.
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patent: 05-121482 (1993-05-01), None
Fukase Katsuya
Sakai Toyoaki
Barreca Nicole
Shinko Electric Industries Co. Ltd.
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