International Business Machines Corporation

Celestica International Inc.

Peter Arrowsmith

Peter Beverley Phipps

John D Duff

There is provided a detector for detecting conductive contaminants entrained in an airflow. The detector comprises first and second electrically conductive meshes mounted in a spaced apart relationship to provide an operational gap. Each of the meshes is sized to provide a relatively large surface for substantially intersecting the airflow and is sufficiently porous so as not to substantially attenuate the airflow. The meshes form part of an energizable electric circuit wherein the operational gap constitutes a discontinuity of the circuit. The detector includes a capacitor connected in parallel to the portion of the circuit containing the operational gap for releasing a charge stored in the capacitor through the circuit discontinuity when one of the conductive contaminants simultaneously contacts the first and second meshes. The detector further provides for indication of a discharge of the capacitor and thereby the presence of one of the airborne conductive contaminants entrained in the airflow.

Method and apparatus for real-time detection of airborne conductive

A metallic sheet for an electronic housing having a zinc coating on a steel base and a thin metal film, preferably a copper film, covering the zinc coating on one or both sides of the sheet, and a method of making the metal film. The metal film reduces whiskering of the zinc in the zinc coating. Whiskering can also be prevented on other metals anodic to copper such as, for example, tin and cadmium.

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North York, Canada

Peter Arrowsmith