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:
Jun. 18, 1991
Filed:
Dec. 27, 1989
Applicant:
Inventors:
Walter M Downs, Lutherville, MD (US);
Michael J Ankrom, Baltimore, MD (US);
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C25D / ; C25D / ; C25D / ; B05D / ;
U.S. Cl.
CPC ...
204 15 ; 204 351 ; 204 40 ; 427 96 ;
Abstract
A circuit trace/solder pad interface for closely spaced circuit traces is presented in which solder must be deposited to form a solder pad upon the circuit trace and the solder not migrate onto the circuit trace upon solder reflow. Through the intentional selection of solderably incompatible metals for the circuit trace and the solder pad, the solder pad may be isolated from the circuit trace thereby retaining solder on the pad. Furthermore a method for fabricating this circuit trace/solder pad interface is presented.