Unisys Corporation

Lorraine Lo-Lan Wing

Jerry Ihor Tustaniwskyj

James Wittman Babcock

Ronald Allen Norell

Blanquita Ortega Morange

Joel Elwood Wing

Elvira Widyani Preecha

Kenneth Patrick Reilich

A heat-exchanger in a chip tester includes an electric heater and a heatsink which are joined together with a layer of an attach material. The operational period of this heat-exchanger is extended by a method which includes the steps of: 1) testing chips in the chip tester in a manner that puts the heat-exchanger through multiple temperature changes which keep the layer in a solid state and which induce stress-cracks in the layer; 2) subjecting the layer to a crack-healing temperature cycle in which the layer is melted at least partially and re-solidified; and thereafter, 3) repeating the testing step.

Method of extending the operational period of a heat-exchanger in a chip tester

An integrated circuit package is processed by a grinding step, a dissolving step, and a disintegrating step. The grinding step grinds an IC-chip completely off of a substrate, and it also grinds a first portion of a filler layer and a first portion of a set of solder balls which attach the IC-chip to the substrate. This leaves a partial filler layer and partial solder balls on the substrate. The dissolving step dissolves the partial filler layer off of the substrate after the grinding step; and the disintegration step disintegrates at least part of each partial solder ball by subjecting the partial solder balls on the substrate to ultrasonic vibration after the dissolving step. These steps leave the substrate with small solder mounds that can be easily attached to another IC-chip with another set of solder balls.

Process for recycling a substrate from an integrated circuit package

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Escondido, CA, United States of America

Lorraine Lo-Lan Wing