Printed circuit board having through-hole protected by...

Details Printed circuit board having through-hole protected by... Printed circuit board having through-hole protected by...

2005-08-09

2005-08-09

Chambliss, Alonzo (Department: 2814)

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

C257S773000, C361S777000

Reexamination Certificate

active

06927347

ABSTRACT:
A through-hole formed in a printed circuit board is prevented from being contaminated with water-resistant liquid coated on circuit elements. To prevent the water-resistant liquid from flowing into the through-hole, a barrier such as a bank surrounding the through-hole is formed in a screen-printing process for printing other patterns on the circuit board. The barrier is easily and precisely formed in a space between the through-hole and the circuit elements coated with the water-resistant liquid without requiring an additional manufacturing cost. The through-hole is reliably protected against the water-resistant liquid, while eliminating a conventional process of masking the through-hole.

REFERENCES:
patent: 3885304 (1975-05-01), Kaiser et al.
patent: 4729061 (1988-03-01), Brown
patent: 4767892 (1988-08-01), Kobari
patent: 5173766 (1992-12-01), Long et al.
patent: 5220487 (1993-06-01), Patel et al.
patent: 5436203 (1995-07-01), Lin
patent: 5637835 (1997-06-01), Matern
patent: 5831833 (1998-11-01), Shirakawa et al.
patent: 5925445 (1999-07-01), Suzuki
patent: 6248961 (2001-06-01), Enroth et al.
patent: 6291777 (2001-09-01), Burkhart et al.

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