Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2005-03-01
2005-03-01
Arbes, Carl J. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S620000, C029S621000, C029S829000, C029S830000, C029S832000, C029S847000, C174S259000, C338S253000
Reexamination Certificate
active
06860000
ABSTRACT:
The invention is directed to a method to embed a thick film resistor composition into a printed wiring board comprising the steps of applying a reinforcing composition onto a resistor composition disposed on a metallic substrate forming an assembly wherein the resistor composition is at least partially coated with the reinforcing composition; processing the assembly; and applying the assembly onto at least one side of an organic substrate forming a component wherein the organic substrate is at least partially coated with an adhesive layer and wherein the reinforcing composition side of the assembly is embedded into the adhesive layer. The reinforcing composition allows laser trimming of the fired resistor and also eliminates cracking during lamination steps of the invention.
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patent: 3808576 (1974-04-01), Castonguay et al.
patent: 5652055 (1997-07-01), King et al.
patent: 6263243 (2001-07-01), Lang
patent: 6317023 (2001-11-01), Felten
patent: 6500350 (2002-12-01), Hunt et al.
patent: 0 869 705 (1998-10-01), None
patent: 59-138304 (1984-08-01), None
patent: H2-153589 (1990-06-01), None
patent: WO 9839784 (1998-09-01), None
Arbes Carl J.
E.I. du Pont de Nemours and Company
Phan Tim
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