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, 1996
Filed:
Feb. 24, 1995
Iver E Anderson, Ames, IA (US);
Frederick G Yost, Cedar Crest, NM (US);
John F Smith, Ames, IA (US);
Chad M Miller, Ames, IA (US);
Robert L Terpstra, Ames, IA (US);
Iowa State University Research Foudation, Inc., Ames, IA (US);
Sandia Corporation, Albuquerque, NM (US);
Abstract
A Pb-free solder includes a ternary eutectic composition consisting essentially of about 93.6 weight % Sn-about 4.7 weight % Ag-about 1.7 weight % Cu having a eutectic melting temperature of about 217.degree. C. and variants of the ternary composition wherein the relative concentrations of Sn, Ag, and Cu deviate from the ternary eutectic composition to provide a controlled melting temperature range (liquid-solid 'mushy' zone) relative to the eutectic melting temperature (e.g. up to 15.degree. C. above the eutectic melting temperature).