Patent ID: 7147765

Claim:
A reactor for depositing electrophoretic material onto a workpiece, comprising: a head having a workpiece holder, the workpiece holder having a support member and a plurality of electrical contacts projecting inwardly from the support member for providing an electrical current to the workpiece, the workpiece holder being configured to hold the workpiece at least substantially horizontal in a processing position; and a reactor base including an overflow cup; a processing cup in the overflow cup, the processing cup having an inlet coupled to a supply conduit for an electrophoretic emulsion (EPE) and a weir defining a processing zone; a gas control system in the processing cup, the gas control system being configured to inhibit bubbles from residing on the workpiece in the processing position; and an annular electrode in the processing cup, wherein the gas control system is configured to prevent bubbles at the electrode from flowing to the processing zone, and wherein the gas control system comprises an annular bubble trap extending around an interior portion of the processing cup and protecting radially inwardly above the electrode.