Patent Number: 8,875,978

Title: Forming constant diameter spherical metal balls

Abstract: A process and tools for forming spherical metal balls is described incorporating molds, injection molded solder, a liquid or gaseous environment to reduce or remove metal oxides and an unconstrained reflow of metal in a heated liquid or gas and solidification of molten metal in a cooler liquid or gas.

Inventors: Feger; Claudius (Poughkeepsie, NY), Gruber; Peter A. (Mohegan Lake, NY), McLeod; Mark H. (Poughkeepsie, NY), Nah; Jae-Woong (New York, NY)

Assignee: International Business Machines Corporation

International Classification: B23K 37/00 (20060101); B23K 31/02 (20060101)

Expiration Date: 2019-11-04 0:00:00