Apparatus for electrostatically coating articles

Claim 1

IN AN APPARATUS FOR ELECTROSTATICALLY DEPOSITING FINELY DIVIDED PARTICLES OF MATERIAL UPON AN ARTICLE, THE COMBINATION OF A PRECIPITATING CHAMBER, A PLATE ELECTRODE IN THE BOTTOM OF SAID CHAMBER, A PLURALITY OF CLOSELY SPACED ATTENUATED AND POINTED ELECTRODES IN SAID CHAMBER SPACED ABOVE AND DIRECTED GENERALLY TOWARD SAID PLATE ELECTRODE, ELECTRIC MEANS CONNECTED TO SAID ELECTRODES FOR APPLYING AN ALTERNATING POTENTIAL THERETO FOR ESTABLISHING A SELF-RECIFIED UNIDIRECTIONAL ELECTROSTATIC FIELD OF FORCE BETWEEN SAID ELECTRODES, MEANS FOR PRECIPITATING FINELY TO INSURE PARTICLES OF MATERIAL INTO SAID PRECIPITATING CHAMBER ABOVE SAID ELECTROSTATIC FIELD TO INSURE THOROUGH DISTRIBUTION OF THE PARTICLES WHILE FLOATING DOWNWARDLY TOWARD SAID FIELD, AND MEANS FOR INTRODUCING AN ARTICLE INTO SAID FIELD, SAID FINELY DIVIDED PARTICLES FLOATING INTO SAID FIELD AND BEING CHARGED THEREIN TO CAUSE ELECTROSTATIC DEPOSITION OF THE FINELY DIVIDED PARTICLES OF MATERIAL UPON THE ARTICLE.