Electrical connectors – Coupling part with latching means and tether or explosive to...
Patent
1988-02-26
1989-12-26
Dees, Jose G.
Electrical connectors
Coupling part with latching means and tether or explosive to...
430319, 430327, 430328, 430330, G03C 1112
Patent
active
048897906
ABSTRACT:
A dry film for forming a solder mask includes a cover sheet, a photoimageable composition layer which is curable to form a solder mask and a top coat interposed between the cover sheet and the photoimageable composition layer which is selectively adherent to the photoimageable composition layer. The dry film is applied to a surface of a printed circuit board with a minor portion of the area of the photoimageable composition layer tacked to the printed circuit board. The cover sheet is peeled away. With heat and vacuum, the photoimageable composition layer is laminated to the irregular surface of the printed circuit board, conforming the photoimageable composition layer to the contours thereof and leaving the top coat as a protective covering over the photoimageable composition layer. The photoimageable composition layer is exposed to patterned actinic radiation, developed and cured to form a hard, permanent solder mask.
REFERENCES:
patent: 4127436 (1978-11-01), Friel
patent: 4360570 (1982-11-01), Andreades et al.
patent: 4530896 (1985-07-01), Christensen et al.
Axon Fredrick J.
Briguglio James J.
Roos Leo
Dees Jos,e G.
Morton Thiokol Inc.
Nacker Wayne E.
White Gerald K.
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