Abstract: A system and method for classifying failures of semiconductor integrated circuit dies using a unique input vector created from die level characterization data to classify wafer (process related) and die level (defect related) patterns. The failure classification may then be used to assign the appropriate yield loss by die. The classification results produced by the plurality of classifiers are examined with a preference towards assigning a wafer level failure classification to failure data for a die when any of the plurality of failure classification results indicates a presence of a wafer level failure.

Abstract: A system and method for classifying failures of semiconductor integrated circuit dies using a unique input vector created from die level characterization data to classify wafer (process related) and die level (defect related) patterns. The failure classification may then be used to assign the appropriate yield loss by die. The classification results produced by the plurality of classifiers are examined with a preference towards assigning a wafer level failure classification to failure data for a die when any of the plurality of failure classification results indicates a presence of a wafer level failure.

Abstract: A gravity-operated tube gripper and puller actuated by a rotatably-operated latch is disclosed herein. The gripper includes a gripping means having a collet assembly with a threaded collet which is expandable by means of a frustro-conical body. The gripper further includes a suspension member connected to the frustro-conical body, and detachably connected to the expandable collet. The rotatably-operated latch of the gripper selectively disconnects the collet assembly, so that the weight of the frustro-conical body engages the mouth of the expandable collet, and expands the threaded exterior of the collet into the inner walls of the tube. The invention provides a tube gripper which is easily manually operated through a simple extension rod. It is particularly useful in removing sample tubes from areas of limited accessibility in the secondary sides of nuclear steam generators.

Abstract: Both an apparatus and a process for pulling tubes from a tubesheet with two relatively movable gripping means are disclosed herein. The apparatus of the invention is a tube puller which has upper and lower gripping means for gripping the section of the tube surrounded by the tubesheet. The two gripping means are mechanically linked together by means of an extendable connecting assembly. This assembly includes an outer sleeve where the lower gripping means is located, and a middle sleeve where the upper gripping means is located which is slidable a predetermined distance within the outer sleeve. In the process of the invention, a tube puller as heretofore described is inserted into the mouth of a tube. The lower gripping means is then engaged to the mouth of the tube. The upper gripping means is then engaged in a section of the tube beyond the tube mouth with the extendable connecting assembly in a contracted position.