Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
240 words
PROCESS FOR ELECTROPHOTOGRAPHIC DISCHARGE AREA DEVELOPMENT CONSISTING ESSENTIALLY OF UNIFORMLY ELECTROSTATICALLY CHARGING A PHOTOCONDUCTIVE INSULATING LAYER, EXPOSING SAID, PHOTOCONDUCTIVE LAYER TO AN ORIGINAL IMAGE PATTERN OF LIGHT AND SHADOW, SAID PHOTOCONDUCTIVE LAYER BEING DISCHARGED IN AREAS CORRESPONDING TO THE LIGHT AREAS TO THE IMAGEING PATTERN AND RETAINING CHARGE IN AREAS CORRESPONDING TO THE SHADOW AREAS OF THE IMAGE PATTERN, SAID CHARGED AND DISCHARGED AREAS OF SAID PHOTOCONDUCTIVE LAYER RESULTING IN THE FORMATION OF AN ELECTROSTATIC LATENT IMAGE CORRESPONDING TO THE ORIGINAL IMAGE PATTERN, DEVELOPING SAID ELECTROSTATIC LATENT IMAGE WITH A FIRST DEVELOPER CONTAINING A TONER WHICH IS SUBSTANTIALLY INVISIBLE WHEN VIEWED AGAINST THE PHOTOCNDUCTIVE LAYER, SAID TONER HAVING THE SAME OR OPPOSITE POLARITY AS THAT OF CHARGED AREAS ON THE PHOTOCONDUCTIVE LAYER AND HAVING INSULATING PROPERTIES TO PREVENT RELEASE OF ITS CHARGE TO THE PHOTOCONDUCTIVE LAYER WHEREBY THE TONER PREFERENTIALLY ADHERES TO AREAS OF SAID LAYER WHEREIN CHARGED AN DISCHARGED AREAS MEET, SUCH AREAS EXHIBITING AN ELECTRIC FIELD GRADIENT, THEREAFTER, DEVELOPING SAID ELECTROSTATIC LATENT IMAGE WITH A SECOND DEVELOPER CONTAINING A COLORED TONER WHICH IS VISIBLE WHEN VIEWED AGAINST THE PHOTO CONDUCTUVVE LAYER BY CONTACTING SAID LAYER WITH SAID SECOND DEVELOPER, SAID TONER HAVING THE SAME POLARITY AS THAT OF THE CHARGED AREAS ON THE PHOTOCONDUCTIVE LAYER SIMULTANEOUSLY ESTABLISHING A POTENTIAL BETWEEN SAID SECOND DEVELOPER AND THE PHOTOCONDUCTIVE LAYER THEREBY DEPOSITING THE COLOR TONER IN THE DISCHARGED AREAS OF SAID LAYER FORMING A REVERSAL IMAGE OF THE ORIGINAL IMAGE PATTERN.
Claim 2
Dependent Claim
240 words
PROCESS FOR ELECTROPHOTOGRAPHIC DISCHARGE AREA DEVELOPMENT CONSISTING ESSENTIALLY OF UNIFORMLY ELECTROSTATICALLY CHARGING A PHOTOCONDUCTIVE INSULATING LAYER, EXPOSING SAID, PHOTOCONDUCTIVE LAYER TO AN ORIGINAL IMAGE PATTERN OF LIGHT AND SHADOW, SAID PHOTOCONDUCTIVE LAYER BEING DISCHARGED IN AREAS CORRESPONDING TO THE LIGHT AREAS TO THE IMAGEING PATTERN AND RETAINING CHARGE IN AREAS CORRESPONDING TO THE SHADOW AREAS OF THE IMAGE PATTERN, SAID CHARGED AND DISCHARGED AREAS OF SAID PHOTOCONDUCTIVE LAYER RESULTING IN THE FORMATION OF AN ELECTROSTATIC LATENT IMAGE CORRESPONDING TO THE ORIGINAL IMAGE PATTERN, DEVELOPING SAID ELECTROSTATIC LATENT IMAGE WITH A FIRST DEVELOPER CONTAINING A TONER WHICH IS SUBSTANTIALLY INVISIBLE WHEN VIEWED AGAINST THE PHOTOCNDUCTIVE LAYER, SAID TONER HAVING THE SAME OR OPPOSITE POLARITY AS THAT OF CHARGED AREAS ON THE PHOTOCONDUCTIVE LAYER AND HAVING INSULATING PROPERTIES TO PREVENT RELEASE OF ITS CHARGE TO THE PHOTOCONDUCTIVE LAYER WHEREBY THE TONER PREFERENTIALLY ADHERES TO AREAS OF SAID LAYER WHEREIN CHARGED AN DISCHARGED AREAS MEET, SUCH AREAS EXHIBITING AN ELECTRIC FIELD GRADIENT, THEREAFTER, DEVELOPING SAID ELECTROSTATIC LATENT IMAGE WITH A SECOND DEVELOPER CONTAINING A COLORED TONER WHICH IS VISIBLE WHEN VIEWED AGAINST THE PHOTO CONDUCTUVVE LAYER BY CONTACTING SAID LAYER WITH SAID SECOND DEVELOPER, SAID TONER HAVING THE SAME POLARITY AS THAT OF THE CHARGED AREAS ON THE PHOTOCONDUCTIVE LAYER SIMULTANEOUSLY ESTABLISHING A POTENTIAL BETWEEN SAID SECOND DEVELOPER AND THE PHOTOCONDUCTIVE LAYER THEREBY DEPOSITING THE COLOR TONER IN THE DISCHARGED AREAS OF SAID LAYER FORMING A REVERSAL IMAGE OF THE ORIGINAL IMAGE PATTERN.
Claim 3
Dependent Claim
19 words
Process as defined in claim 1 wherein a potential is established between said first developer and the photoconductive layer.
Claim 4
Dependent Claim
25 words
Process as defined in claim 1 wherein said substantially invisible toner of the first developer comprises colorless, light-colored or white polymers, pigments or mixtures thereof.
Claim 5
Dependent Claim
14 words
Process as defined in claim 1 wherein the photoconductive insulating layer comprises amorphous selenium.
Claim 6
Dependent Claim
19 words
Process as defined in claim 1 wherein the photoconductive insulating layer comprises zinc oxide in an insulating resin binder.
Claim 7
Dependent Claim
20 words
Process as defined in claim 1 wherein the colored toner of the second developer contains carbon black as the colorant.
Claim 8
Dependent Claim
25 words
Process as defined in claim 1 wherein the toner of the first developer has the same polarity as the charged areas of the photoconductive layer.
Claim 9
Dependent Claim
27 words
Process as defined in claim 1 wherein the toner of the first developer has the opposite polarity as that of the charged areas of the photoconductive layer.