Method of developing an electrostatic

Claim 1

THE METHOD OF DEVELOPING AN ELECTROSTATIC LATENT IMAGE OF A GIVEN POLARITY FORMED ON A XEROGRAPHIC PLATE BY EXPOSURE OF A SENSITIVE XEROGRAPHIC PLATE TO A LIGHT AND SHADOW PATTERN OF AN ORIGINAL TO BE REPRODUCED, SAID ELECTROSTATIC LATENT IMAGE HAVING AREAS OF CHARGE OF A FIRST POTENTIAL OF ABOUT 800 VOLTS CORRESPONDING TO AREAS OF SHADOW DURING EXPOSURE AND HAVING AREAS OF CHARGE O A SECOND POTENTIAL BETWEEN ABOUT 175 VOLTS AND ABOUT 200 VOLTS CORRESPONDING TO AREAS OF LIGHT DURING EXPOSURE, SAID METHOD COMPRISING ROTATING A BRUSH COMPRISING A MULTIPLICIY OF UNITARY FIBERS PERMANENTLY INTERRLATED AT A BASE EXTENDING SUBSTANTIALLY OUTWARDLY FROM THE BASE, SAID FIBERS BEING SUBSTANTIALLY OF UNIFORM LENGTH AND BEING CHARATERIZED AS HAVING VARYING ELECTRICAL CONDUCTIVITY DEPENDING ON AMBIENT HUMIDITY, LOADING SAID BRUSH DURING ROTATION OF SAID BRUSH WITH XEROGRAPHIC DEVELOPING POWDER BY FEEDING SAID POWDER INTO CONTACT WITH SAID BRUSH DURING ROTATION, THE POWDER BEING OF A MATERIAL RELATIVE TO THE MATERIAL COMPRISING THE FIBERS TO CAUSE TRIBOELECTRIC ADHERENCE OF THE POWDER TO THE FIBERS WHILE ELECTROSTATICALY CHARGING THE POWDER TO A POLARITY OPPOSITE TO THE POLARITY OF THE ELECTROSTATIC CHARGES WHICH COMPRISE THE ELCTROSTATIC LATENT IMAGE TO BE DEVELOPED, APPLYING A BIAS POTENTIAL OF SAID GIVEN POLARITY TO THE BASE OF SAID BRUSH OF A MAGNITUDE BETWEEN ABOUT 200 VOLTS AND ABOUT 350 VOLTS, AND APPLYING XEROGRAPHIC DEVELOPING POWDER TO SAID PLATE FROM SAID BRUSH DURING ROTATION OF SAID BRUSH AND AT A POINT FOLLOWING LOADING OF SAID BRUSH BY MAKING BRUSHING CONTACT WITH SAID BRUSH AGAINST SAID PLATE TO FORM A DEVELOPED IMAGE SUBSTANTIALLY FREE OF BACKGROUND AND OF A SUBSTANTIALLY UNIFORM QUALITY REGARDLESS OF AMBIENT RELATIVE HUMIDITY WHICH CONFORMS TO SAID ELECTROSTATIC LATENT IMAGE.

Claim 2

THE METHOD OF DEVELOPING AN ELECTROSTATIC LATENT IMAGE OF A GIVEN POLARITY FORMED ON A XEROGRAPHIC PLATE BY EXPOSURE OF A SENSITIVE XEROGRAPHIC PLATE TO A LIGHT AND SHADOW PATTERN OF AN ORIGINAL TO BE REPRODUCED, SAID ELECTROSTATIC LATENT IMAGE HAVING AREAS OF CHARGE OF A FIRST POTENTIAL OF ABOUT 800 VOLTS CORRESPONDING TO AREAS OF SHADOW DURING EXPOSURE AND HAVING AREAS OF CHARGE O A SECOND POTENTIAL BETWEEN ABOUT 175 VOLTS AND ABOUT 200 VOLTS CORRESPONDING TO AREAS OF LIGHT DURING EXPOSURE, SAID METHOD COMPRISING ROTATING A BRUSH COMPRISING A MULTIPLICIY OF UNITARY FIBERS PERMANENTLY INTERRLATED AT A BASE EXTENDING SUBSTANTIALLY OUTWARDLY FROM THE BASE, SAID FIBERS BEING SUBSTANTIALLY OF UNIFORM LENGTH AND BEING CHARATERIZED AS HAVING VARYING ELECTRICAL CONDUCTIVITY DEPENDING ON AMBIENT HUMIDITY, LOADING SAID BRUSH DURING ROTATION OF SAID BRUSH WITH XEROGRAPHIC DEVELOPING POWDER BY FEEDING SAID POWDER INTO CONTACT WITH SAID BRUSH DURING ROTATION, THE POWDER BEING OF A MATERIAL RELATIVE TO THE MATERIAL COMPRISING THE FIBERS TO CAUSE TRIBOELECTRIC ADHERENCE OF THE POWDER TO THE FIBERS WHILE ELECTROSTATICALY CHARGING THE POWDER TO A POLARITY OPPOSITE TO THE POLARITY OF THE ELECTROSTATIC CHARGES WHICH COMPRISE THE ELCTROSTATIC LATENT IMAGE TO BE DEVELOPED, APPLYING A BIAS POTENTIAL OF SAID GIVEN POLARITY TO THE BASE OF SAID BRUSH OF A MAGNITUDE BETWEEN ABOUT 200 VOLTS AND ABOUT 350 VOLTS, AND APPLYING XEROGRAPHIC DEVELOPING POWDER TO SAID PLATE FROM SAID BRUSH DURING ROTATION OF SAID BRUSH AND AT A POINT FOLLOWING LOADING OF SAID BRUSH BY MAKING BRUSHING CONTACT WITH SAID BRUSH AGAINST SAID PLATE TO FORM A DEVELOPED IMAGE SUBSTANTIALLY FREE OF BACKGROUND AND OF A SUBSTANTIALLY UNIFORM QUALITY REGARDLESS OF AMBIENT RELATIVE HUMIDITY WHICH CONFORMS TO SAID ELECTROSTATIC LATENT IMAGE.