Xerographic plate and a process of copy-making

Claim 1

A XEROGRAPHIC PLATE CAPABLE OF FORMING AN ELECTROSTATIC IMAGE DEVELOPABLE WITH ELECTROSCOPIC MARKING MATERIAL COMPRISING A SUPPORT MEMBER HAVING AT LEAST ONE SMOOTH SURFACE FREE FROM VISIBLE IMPERFECTIONS THROUGHOUT THE AREA WITHIN WHICH SAID IMAGE IS TO BE FORMED, AT LEAST SAID SURFACE AREA HAVING AN ELECTRICAL RESISTANCE AT LEAST SEVERAL ORDERS OF MAGNITUDE LOWER THAN THE RESISTANCE OF ILLUMINATED VITREOUS SELENIUM AND, OVERLYING AND SUPPORTED BY SAID SURFACE AND IN ELECTRICAL CONTACT THEREWITH THROUGHOUT SAID AREA, AN ADHERENT LAYER CONSISTING ESSENTIALLY OF REDDISH-BLACK GLASSY-APPEARING PHOTOCONDUCTIVE INSULATING VITREOUS SELENIUM, SAID LAYER OF SELENIUM HAVING A SMOOTH EXPOSED SURFACE, A UNIFORM THICKNESS AVERAGING MORE THAN ABOUT 10 MICRONS WITHIN THE IMAGE AREA, A CHARGE ACCEPTANCE IN EXCESS OF ABOUT 300 VOLTS, AND A CHARGE DISSIPATION RATE UNDER ONE METER-CANDLE-SECOND OF ILLUMINATION AT LEAST ABOUT 25 TIMES GREATER THAN ITS CHARGE DISSIPATION RATE IN DARKNESS.