Xerographic plate and processes of making and using same

Claim 1

A XEROGRAPHIC PLATE MEMBER COMPRISING A RELATIVELY THICK SUBSTANTIALLY UNIFORM LAYER OF A WIDE BAND GAP SEMICONDUCTING MATERIAL HAVING GOOD ELECTRICAL RESISTIVITY IN DARKNESS AND CAPABLE OF CONDUCTING CHARGE CARRIERS INJECTED THEREIN, A SUBSTANTIALLY UNIFORM LAYER OF NARROW BAND GAP PHOTOCONDUCTIVE MATERIAL WITH A THICKNESS OF LESS THAN ABOUT 0.1 MICRON IN ELECTRICAL CONTACT WITH A SURFACE OF SAID WIDE BAND GAP MATERIAL, AND AN INSULATING MATERIAL IN ELECTRICAL CONTACT WITH THE SURFACE OF SAID NARROW BAND LAYER OPPOSITE TO THE SURFACE OF SAID LAYER IN ELECTRICAL CONTACT WITH SAID WIDE BAND MATERIAL, AND A SUPPORTING CONDUCTIVE SUBSTRATE IN ELECTRICAL CONTACT WITH SAID INSULATING MATERIAL OPPOSITE TO THE SURFACE OF SAID NARROW BAND GAP MATERIAL WITH SAID NARROW GAP MATERIAL, SUFFICIENTLY TO MAINTAIN THE FIELD THEREACROSS WHEN THE PLATE MEMBER IS SUBJECTED TO AN ELECTROSTATIC CHARGE AND SAID PLATE MEMBER BEING CHARACTERIZED AS CAPABLE OF DISSIPATING CHARGE IN AREAS EXPOSED TO LIGHT TO FORM A XEROGRAPHICALLY DEVELOPABLE ELECTROSTATIC CHARGE PATTERN.