The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 1978
Filed:
Apr. 02, 1976
Applicant:
Inventors:
Donald Dinella, Union, NJ (US);
Richard M Kovaric, Verona, NJ (US);
Assignee:
Western Electric Co., Inc., New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05K / ;
U.S. Cl.
CPC ...
174 685 ;
Abstract
A circuit pattern on a circuit board has at least one contact finger termination to be coupled to a connector contact. A conductive overlay is solder-bonded to the base metal of the contact finger. The overlay is a composite structure of a number of layers. A base layer of copper faces, and is solder-bonded, to the base. A surface layer of gold provides a contact area for the connector contact. A layer of nickel between the base layer and the surface layer acts as a barrier layer to prevent copper from migrating through the surface layer to deposit as a contaminant on the surface of the contact area.