Circuit board material with barrier layer

Details Circuit board material with barrier layer Circuit board material with barrier layer

1996-01-17

1997-11-18

Lam, Cathy F.

Electrical resistors

With base extending along resistance element

Resistance element coated on base

338309, 338314, 338327, 338328, 252513, 252518, 428667, 428209, 428901, H01C 1012, H01C 1142, H01C 114, B32B 300

Patent

active

056892276

ABSTRACT:
A circuit board material is disclosed which includes a support layer, at least one electrical resistance layer having a preselected resistivity adhered to the support layer, a barrier layer adhered to the electrical resistance layer, and a conductive layer adhered to the barrier layer. The barrier layer is capable of protecting the resistance layer from attack by alkaline ammoniacal copper etchants. A method of producing the circuit board material is also disclosed.

REFERENCES:
patent: 2662957 (1953-12-01), Eisler
patent: 3808576 (1974-04-01), Castonguay et al.
patent: 4220945 (1980-09-01), Kabuhashi et al.
patent: 4503112 (1985-03-01), Konicek
patent: 4808967 (1989-02-01), Rice et al.
patent: 4888574 (1989-12-01), Rice et al.
patent: 4892776 (1990-01-01), Rice

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