Printed circuit fabrication

Details Printed circuit fabrication Printed circuit fabrication

2005-02-22

2005-02-22

Huff, Mark F. (Department: 1756)

Radiation imagery chemistry: process, composition, or product th

Radiation modifying product or process of making

Radiation mask

C216S017000

Reexamination Certificate

active

06858352

ABSTRACT:
A mask for producing a printed circuit board is defined in which the conductor elements of the printed circuit pattern are delineated by a constant width etch band (20). This means that all conductors (3a, 3b, 9) are separated from neighboring areas of conductive material (22) by the same distance. Thus etch rates across the printed circuit pattern do not vary according to the separation of the conductors (3a, 3b, 9).

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“Laser Scribed Labyrinte Type Circuit for Circuit Board”; IBM Technical Disclosure Bulletin; Armonk, NY; vol. 32, No. 6B; pp. 359-361; Nov. 1989; XP000073766.
Tanaka, Yasuo et al; “Three Micron Meter Copper Foil Clad Laminate for 30/30 MCRON Meter Line/Space Circuit”; Circuitree; pp. 40-44; Nov. 1997; XP000978483.
“Subractive Etch Promoting Dummy Lines”; IBM Technical Disclosure Bulletin; Armonk, NY; vol. 32, No. 3B; p. 323; Aug. 1989; XP000029839.

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