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:
Nov. 12, 1996
Filed:
Dec. 19, 1994
Applicant:
Inventors:
Kingshuk Banerji, Plantation, FL (US);
Edwin L Bradley, III, Plantation, FL (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
148 24 ; 2282481 ; 428570 ;
Abstract
A solder paste is made from solder powder having two different alloys. The individual particles in the solder powder consist of a low melting solder coating (115) that surrounds a nucleus (120) of a higher melting solder. The low melting solder is compositionally distinct from the higher melting solder. The particles are suspended in a matrix of a solder paste vehicle, which may also contain a fluxing agent. In one embodiment of the invention, the low melting solder is an alloy of 43% tin, 43% lead and 14% bismuth, and the higher melting solder is an alloy of 52% tin, and 48% bismuth.