Thermal resensitization of desensitized silver halide photographic emulsions

Claim 1

A METHOD OF PRODUCING THERMOGRAPHIC COPIES OF AN ORIGINAL CONTAINING PORTIONS HIGHLY ABSORPTIVE OF INFRARED RADIATION AND PORTIONS SUBSTANTIALLY NONABSORPTIVE OF INFRARED RADIATION WHICH COMPRISES PLACING SAID ORIGINAL IN SURFACE CONTACT WITH A DESENTIZED PHOTOGRAPHIC NEGATIVE-TYPE, DEVELOPING OUT, UNFOGGED, SILVER HALIDE EMULSION COATED ON A SUPPORT, SAID DENSENSITIZED EMULSION CONTAINING SUFFICIENT QUANTITY OF PHOTOGRAPHIC SILVER HALIDE EMULSION CHEMICAL DENSENSITIZER SELECTED FROM THE GROUP CONSISTING OF A MERECURY SALT, A RHODIUM SALT, AN ANTHRAQUINONE DYE CONTAINING A SULFOALKYLAMINOSULFONE RADICAL, A NON-HETEROCYCLIC AROMATIC COMPOUND AT LEAST ONE NITRO RADICAL, AND A HETEROCYCLIC COMPOUND CONTAINING AT LEAST ONE HETERO ATOM SELECTED FROM THE GROUP CONSISTING OF A SULFUR ATOM AND A NITROGEN ATOM TO RENDER SAID EMULSION SUBSTANTIALLY INSENSITIVE TO THE FORMATION OF LATENT IMAGES AT RADIATIONS OF WAVE LENGTHS BETWEEN ABOUT 1 AND 1200 MU, SUBJECTING SAID EMULSION THROUGH SAID ORIGINAL TO INFRARED RADIATION TO SELECTIVELY HEAT TO A TEMPERATURE OF ABOUT 100*C. TO 300*C. AND RESENSITIZE SAID EMULSION TO AT LEAST 10 TIMES THE DESENTIZED SPEED TO RADIATIONS OF WAVE LENGTHS BETWEEN ABOUT 1 AND 1200 MU AND TO FORM A SENSISTIZED PATTERN PORTION IN SAID EMULSION CORRESPONDING TO THE SAID HIGHLY INFRARED ABSORPTIVE PORTIONS OF SAID ORIGINAL, FOGGING SAID SENSITIZED PATTERN PORTION OF SAID EMULSION TO FORM A LATENT IMAGE, AND DEVELOPING A SILVER IMAGE IN SAID EMULSION BY TREATING SAID EMULSION WITH A PHOTOGRAPHIC DEVELOPER.

Claim 2

A METHOD OF PRODUCING THERMOGRAPHIC COPIES OF AN ORIGINAL CONTAINING PORTIONS HIGHLY ABSORPTIVE OF INFRARED RADIATION AND PORTIONS SUBSTANTIALLY NONABSORPTIVE OF INFRARED RADIATION WHICH COMPRISES PLACING SAID ORIGINAL IN SURFACE CONTACT WITH A DESENTIZED PHOTOGRAPHIC NEGATIVE-TYPE, DEVELOPING OUT, UNFOGGED, SILVER HALIDE EMULSION COATED ON A SUPPORT, SAID DENSENSITIZED EMULSION CONTAINING SUFFICIENT QUANTITY OF PHOTOGRAPHIC SILVER HALIDE EMULSION CHEMICAL DENSENSITIZER SELECTED FROM THE GROUP CONSISTING OF A MERECURY SALT, A RHODIUM SALT, AN ANTHRAQUINONE DYE CONTAINING A SULFOALKYLAMINOSULFONE RADICAL, A NON-HETEROCYCLIC AROMATIC COMPOUND AT LEAST ONE NITRO RADICAL, AND A HETEROCYCLIC COMPOUND CONTAINING AT LEAST ONE HETERO ATOM SELECTED FROM THE GROUP CONSISTING OF A SULFUR ATOM AND A NITROGEN ATOM TO RENDER SAID EMULSION SUBSTANTIALLY INSENSITIVE TO THE FORMATION OF LATENT IMAGES AT RADIATIONS OF WAVE LENGTHS BETWEEN ABOUT 1 AND 1200 MU, SUBJECTING SAID EMULSION THROUGH SAID ORIGINAL TO INFRARED RADIATION TO SELECTIVELY HEAT TO A TEMPERATURE OF ABOUT 100*C. TO 300*C. AND RESENSITIZE SAID EMULSION TO AT LEAST 10 TIMES THE DESENTIZED SPEED TO RADIATIONS OF WAVE LENGTHS BETWEEN ABOUT 1 AND 1200 MU AND TO FORM A SENSISTIZED PATTERN PORTION IN SAID EMULSION CORRESPONDING TO THE SAID HIGHLY INFRARED ABSORPTIVE PORTIONS OF SAID ORIGINAL, FOGGING SAID SENSITIZED PATTERN PORTION OF SAID EMULSION TO FORM A LATENT IMAGE, AND DEVELOPING A SILVER IMAGE IN SAID EMULSION BY TREATING SAID EMULSION WITH A PHOTOGRAPHIC DEVELOPER.