Device for tesiprinting

Claim 1

AN IMAGING SYSTEM COMPRISING IN COMBINATION A CONDUCTIVE CHARACTER ELECTRODE COMPRISING RAISED AND DEPRESSED PORTIONS, SAID RAISED PORTIONS DEFINING A CHARACTER TO BE PRINTED, A RELATIVELY FLAT CONDUCTIVE BACKING ELECTRODE SPACE FROM SAID RAISED PORTIONS ON SAID CHARACTER ELECTRODE TO DEFINE THEREBY A GAP, MEANS TO SUPPORT AN INSULATING PRINTING MEMBER IN SAID GAP SPACED FROM SAID BACKING ELECTRODE, MEANS TO DEPOSIT SOLID ELECTROSCOPIC MATERIAL ON THE SURFACE OF SAID FLAT ELECTRODE EXPOSED TO SAID GAP, AND MEANS TO APPLY A POTENTIAL OF FROM ABOUT 6000 TO ABOUT 2,000 VOLTS ACROSS SAID ELECTRODES, SAID POTENTIAL BEING OF POLARITY TO MOVE SAID ELECTROSCOPIC MATERIALS FROM SAID FLAT ELECTRODE TOWARD SAID CHARACTER ELECTRODE, FORMING THEREBY A PATTERN OF CHARGE CORRESPONDING TO THE CONFIGURATION OF SAID RAISED PORTIONS OF SAID CHARACTER ELECTRODE ON SAID PRINTING MEMBER AND CAUSING SAID ELECTROSCOPIC MATERIAL OPPOSITE THE RAISED PORTIONS OF SAID CHARACTER ELECTRODE TO MOVE FROM SAID FLAT ELECTRODE TO SAID PRINTING MEMBER TO THEREBY RENDER THE PATTERN OF CHARGE VISIBLE.