Nickel/indium alloy and method of using same in the manufacture of printed circuit boards

Patent · Tue Aug 11 00:00:00 EDT 1987

OSTI ID:6098125

Samuels, G J; Garman, J M

This patent describes an improved method of preparing a printed circuit board from a metal clad substrate which comprises: (a) covering at least one of the surfaces of the metal clad substrate with a coating of photoresist; (b) masking the photoresist with a predetermined circuit design image; (c) exposing the photoresist to a source of energy to provide a resist layer portion susceptible to a etchant over a desired circuit image on at least one of the surfaces, and a resist layer portion resistant to the etchant over the remainder of the surfaces; (d) removing those portions of the photoresist which are susceptible to the etchant to provide the desired circuit image on at least one of the surfaces of the metal cladding; (e) electroplating the desired circuit image with a metallic etch resist; (f) removing the remaining portions of the photoresist from the board exposing a portion of the metal cladding; and (g) removing the exposed metal cladding from the board to provide a board having metal circuit covered by a metallic etch resist, the improvement comprising a metallic etch resist composed of a nickel/indium alloy containing from about 0.1 to about 10 weight percent indium based on the total weight of the alloy.

• Assignee: Allied Corp., Morris Township, Morris County, NJ
• Patent Number(s): US 4686015
• OSTI ID: 6098125
• Resource Relation: Patent File Date: Filed date 19 Jun 1986
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
INDIUM ALLOYS
FABRICATION
NICKEL ALLOYS
PRINTED CIRCUITS
ELECTROPLATING
IMAGES
PHOTORESISTORS
QUANTITY RATIO
SUBSTRATES
ALLOYS
DEPOSITION
ELECTRICAL EQUIPMENT
ELECTRODEPOSITION
ELECTROLYSIS
ELECTRONIC CIRCUITS
EQUIPMENT
LYSIS
PLATING
RESISTORS
SURFACE COATING
360101* - Metals & Alloys- Preparation & Fabrication
420800 - Engineering- Electronic Circuits & Devices- (-1989)