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:
Aug. 13, 1991
Filed:
Apr. 12, 1990
Harold P Wilson, Huron, OH (US);
Atochem North America, Inc., Philadelphia, PA (US);
Abstract
An electroplating bath, cell and method for the electrodeposition of a wide range of tin-bismuth alloys onto a conductive substrate comprises tin and bismuth ion in aqueous solution, and an alkyl sulfonic or polysulfonic acid or salt as the electrolyte. The sulfonic component is present in amounts sufficient to maintain the bismuth in solution. In the operation of the method of the invention, electroplated tin-bismuth eutectic alloys of controlled composition are obtained. The alloys of tin and bismuth contain amounts of both metals such that the plated alloy has a melting point substantially lower than that of either metal alone, and a melting point lower than that of a tin-lead alloy.