Liquid developer containing extender body particles

Claim 1

AN ELECTROSTATORGRAPHIC LIQUID DEVELOPER COMPRISING AN INSULATING LIQUID VEHICLE HAVING A VOLUME RESISTIVITY GREATER THAN ABOUT 10**10 OHM-CM AND DISPERSED THEREIN CHARGED COLORED TONER PARTICLES AND WHILE EXTENDER BODY PIGMENT PARTICLES SELECTED FROM THE GROUP CONSISTING OF CALCIUM CARBONATE, ALUMINUM HYDROXIDE, AND MIXTURES THEREOF; SAID EXTENDER BODY PIGMENT PARTICLES BEING PRESENT IN FROM ABOUT ONE TENTH TO ABOUT TEN TIMES THE AMOUNT OF THE CHARGED COLORED TONER PARTICLES AND HAVING A PARTICLE SIZE OF FROM ABOUT 0.01 TO ABOUT MICRONS, SAID TONER PARTICLES HAVING A SIZE OF FROM ABOUT 0.01 TO ABOUT 1 MICRON; SAID EXTENDER BODY PIGMENT PARTICLES HAVING A POSITIVE CHARGE, BOTH SAID CHARGED TONER PARTICLES AND SAID CHARGED BODY PIGMENT PARTICLES BEING CAPABLE OF BEING SIMULTANEOUSLY DEPOSITED FROM SAID LIQUID DEVELOPER IN RESPONSE TO A CHARGE OF OPPOSITE POLARITY ON THE LATENT IMAGE AREAS OF AN IMAGING SURFACE AND SAID CHARGED BODY PIGMENT PARTICLES BEING CAPABLE OF PREFERENTIAL DEPOSITION IN THE BACKGROUND PORTIONS OF SAID IMAGING SYRFACE.