Transfer of electrostatic charge pattern

Claim 1

A METHOD OF FORMING AN ELECTROSTATIC LATENT IMAGE ON A XEROGRAPIC PLATE COMPRISING A PHOTOCONDUCTIVE INSULATING LAYER OVERLYING A CONDUCTIVE BACKING MEMBER AND IN ELECTRICALLY CONDUCTIVE CONTACT THEREWITH, SAID METHOD COMPRISING POSITIONING CLOSELY SPACED OVER THE PHOTOCONDUCTIVE INSULATING LAYER A CONDUCTIVE ELECTRODE SEPARATED FROM SAID PHOTOCONDUCTIVE INSULATING LAYER BY A LAYER STRUCTURE COMPRISING A SOLID INSULATING FILM, THE SURFACE OF THE INSULATING FILM FACING THE PHOTOCONDUCTIVE INSULATING LAYER BEING IN VIRTUAL CONTACT THEREWITH, APPLYING TO SAID ELECTRODE A FIRST POTENTIAL, WITH RESPECT TO THE BACKING MEMBER OF A MAGNITUDE OF AT LEAST ABOUT 100 VOLTS WHILE SIMULTANEOUSLY EXPOSING THE PHOTOCONDUCTIVE INSULATING LAYER TO A LIGHT IMAGE PATTERN TO SELECTIVELY INCREASE ITS CONDUCTIVITY SELECTIVELY ALLOWING CURRENT FLOW TO THE SURFACE OF THE PHOTOCONDUCTIVE INSULATING LAYER IN VIRTUAL CONTACT WITH SAID INSULATING LAYER IN ACCORDANCE WITH THE LIGHT IMAGE PATTERN, SAID FIRST APPLIED POTENTIAL BEING OF A SUMCIENT MAGNITUDE TO CAUSE CHARGE TRANSFER IN AREAS EXPOSED TO LIGHT BETWEEN THE SURFACES IN VIRTUAL CONTACT, CUTTING OFF SAID LIGHT IMAGE PATTERN FROM SAID PHOTOCONDUCTIVE INSULATING LAYER, AND SUBSEQUENTLY APPLYING TO SAID ELECTRODE A SECOND POTENTIAL, WITH RESPECT TO THE BACKING MEMBER, OF A POLARITY OPPOSITE TO THE POLARITY OF SAID FIRST POTENTIAL AND OF A MAGNITUDE OF AT LEAST ABOUT 100 VOLTS AND OF A SUFFICIENT MAGNITUDE TO CAUSE TRANSFER BETWEEN THE SURFACES IN VIRTUAL CONTACT AT LEAST IN THE AREA PREVIOUSLY EXPOSED TO LIGHT THEREBY FORMING AN ELECTROSTATIC LATENT IMAGE ON THE PHOTOCONDUCTIVE INSULATING LAYER USABLE IN XEROGRAPHY.

Claim 2

A METHOD OF FORMING AN ELECTROSTATIC LATENT IMAGE ON A XEROGRAPIC PLATE COMPRISING A PHOTOCONDUCTIVE INSULATING LAYER OVERLYING A CONDUCTIVE BACKING MEMBER AND IN ELECTRICALLY CONDUCTIVE CONTACT THEREWITH, SAID METHOD COMPRISING POSITIONING CLOSELY SPACED OVER THE PHOTOCONDUCTIVE INSULATING LAYER A CONDUCTIVE ELECTRODE SEPARATED FROM SAID PHOTOCONDUCTIVE INSULATING LAYER BY A LAYER STRUCTURE COMPRISING A SOLID INSULATING FILM, THE SURFACE OF THE INSULATING FILM FACING THE PHOTOCONDUCTIVE INSULATING LAYER BEING IN VIRTUAL CONTACT THEREWITH, APPLYING TO SAID ELECTRODE A FIRST POTENTIAL, WITH RESPECT TO THE BACKING MEMBER OF A MAGNITUDE OF AT LEAST ABOUT 100 VOLTS WHILE SIMULTANEOUSLY EXPOSING THE PHOTOCONDUCTIVE INSULATING LAYER TO A LIGHT IMAGE PATTERN TO SELECTIVELY INCREASE ITS CONDUCTIVITY SELECTIVELY ALLOWING CURRENT FLOW TO THE SURFACE OF THE PHOTOCONDUCTIVE INSULATING LAYER IN VIRTUAL CONTACT WITH SAID INSULATING LAYER IN ACCORDANCE WITH THE LIGHT IMAGE PATTERN, SAID FIRST APPLIED POTENTIAL BEING OF A SUMCIENT MAGNITUDE TO CAUSE CHARGE TRANSFER IN AREAS EXPOSED TO LIGHT BETWEEN THE SURFACES IN VIRTUAL CONTACT, CUTTING OFF SAID LIGHT IMAGE PATTERN FROM SAID PHOTOCONDUCTIVE INSULATING LAYER, AND SUBSEQUENTLY APPLYING TO SAID ELECTRODE A SECOND POTENTIAL, WITH RESPECT TO THE BACKING MEMBER, OF A POLARITY OPPOSITE TO THE POLARITY OF SAID FIRST POTENTIAL AND OF A MAGNITUDE OF AT LEAST ABOUT 100 VOLTS AND OF A SUFFICIENT MAGNITUDE TO CAUSE TRANSFER BETWEEN THE SURFACES IN VIRTUAL CONTACT AT LEAST IN THE AREA PREVIOUSLY EXPOSED TO LIGHT THEREBY FORMING AN ELECTROSTATIC LATENT IMAGE ON THE PHOTOCONDUCTIVE INSULATING LAYER USABLE IN XEROGRAPHY.