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Claim 1

THE METHOD OF PRODUCING AN IMAGED OFFSET MASTER FROM AN ORIGINAL WHICH DEFINES INFRA-RED ADSORBING AND HEAT GENERATING IMAGE AREAS COMPRISING THE STEPS OF POSITIONING THE ORIGINAL IN SURFACE CONTACT WITH A NEGATIVE SHEET WHICH IS SUBSTANTIALLY TRANSPARENT TO ULTRA-VIOLET AND INFRA-RED RADIATIONS AND WHICH HAS A SUBSTANTIALLY HYDROPHILIC SURFACE WITH A WATER REMOVABLE COATING CONTAINING A SUBSTANCE WHICH IS CONVERTED INTO A WATER REPELLENT PORTION IN RESPONSE TO HEAT, EXPOSING THE ORIGINAL TO RADIATIONS RICH IN INFRA-RED WHEREBY THE HEAT PATTERN GENERATED IN SAID IMAGE AREAS IN RESPONSE TO THE RADIATION OF THE ORIGINAL CONVERTS PORTIONS OF THE NEGATIVE COATING CORRESPONDING TO SAID IMAGE AREAS TO THE WATER REPELLANT PHASE, WASHING THE EXPOSED NEGATIVE WITH AN AQUEOUS MEDIUM TO REMOVE THE COATING FROM TH NON-IMAGED PORTIONS OF THE NEGATIVE AND EXPOSE THE UNDERLYING SUBSTANTIALLY HYDROPHILLIC SURFACE, TREATING THE NEGATIVE WITH AN AQUEOUS SYSTEM CONTAINING A BARRIER TO ULTRA-VIOLET WHEREBY SAID ULTRA-VIOLET BARRIER SUBSTANCE IS RETAINED BY THE SUBSTANTIALLY HYDROPHILIC NON-IMAGED PORTIONS OF THE NEGATIVE AND REPELLED BY THE WATER REPELLENT IMAGED PORTIONS OF THE NEGATIVE, BRINGING THE DEVELOPED NEGATIVE INTO FACE TO FACE RELATIONSHIP WITH THE OFFSET SURFACE OF AN OFFSET PLATE HAVING A COATING CONTAINING A MATERIAL WHICH IS CONVERTED TO AN INK RECEPTIVE, WATER REPELLENT IMAGING MATERIAL RESPONSIVE TO EXPOSURE TO ULTRA-VIOLET, DIRECTING RADIATIONS RICH IN ULTRA-VIOLET ONTO THE DEVELOPED NEGATIVE WHEREBY THE ULTRA-VIOLET BLOCKING AGENT IN THE NON-IMAGED PORTIONS OF THE NEGATIVE PREVENTS PASSGE OF SUFFICIENT AMOUNTS OF ULTRA-VIOLET THERETHROUGH FOR REACTION OF CORRESPONDING PORTIONS OF THE COATING ON THE OFFSET PLATE WHILE SUFFICIENT OF THE ULTRA-VIOLET RADIATION PASS THROUGH THE IMAGED PORRTIONS OF THE NEGATIVE FOR REACTION TO CONVERT THE CORRESPONDING PORTIONS OF THE COATING ON THE OFFSET PLATE OF A WATER REPELLENT, INK RECEPTIVE IMAGE CORRESPONDING TO THE ORIGINAL.

Claim 2

THE METHOD OF PRODUCING AN IMAGED OFFSET MASTER FROM AN ORIGINAL WHICH DEFINES INFRA-RED ADSORBING AND HEAT GENERATING IMAGE AREAS COMPRISING THE STEPS OF POSITIONING THE ORIGINAL IN SURFACE CONTACT WITH A NEGATIVE SHEET WHICH IS SUBSTANTIALLY TRANSPARENT TO ULTRA-VIOLET AND INFRA-RED RADIATIONS AND WHICH HAS A SUBSTANTIALLY HYDROPHILIC SURFACE WITH A WATER REMOVABLE COATING CONTAINING A SUBSTANCE WHICH IS CONVERTED INTO A WATER REPELLENT PORTION IN RESPONSE TO HEAT, EXPOSING THE ORIGINAL TO RADIATIONS RICH IN INFRA-RED WHEREBY THE HEAT PATTERN GENERATED IN SAID IMAGE AREAS IN RESPONSE TO THE RADIATION OF THE ORIGINAL CONVERTS PORTIONS OF THE NEGATIVE COATING CORRESPONDING TO SAID IMAGE AREAS TO THE WATER REPELLANT PHASE, WASHING THE EXPOSED NEGATIVE WITH AN AQUEOUS MEDIUM TO REMOVE THE COATING FROM TH NON-IMAGED PORTIONS OF THE NEGATIVE AND EXPOSE THE UNDERLYING SUBSTANTIALLY HYDROPHILLIC SURFACE, TREATING THE NEGATIVE WITH AN AQUEOUS SYSTEM CONTAINING A BARRIER TO ULTRA-VIOLET WHEREBY SAID ULTRA-VIOLET BARRIER SUBSTANCE IS RETAINED BY THE SUBSTANTIALLY HYDROPHILIC NON-IMAGED PORTIONS OF THE NEGATIVE AND REPELLED BY THE WATER REPELLENT IMAGED PORTIONS OF THE NEGATIVE, BRINGING THE DEVELOPED NEGATIVE INTO FACE TO FACE RELATIONSHIP WITH THE OFFSET SURFACE OF AN OFFSET PLATE HAVING A COATING CONTAINING A MATERIAL WHICH IS CONVERTED TO AN INK RECEPTIVE, WATER REPELLENT IMAGING MATERIAL RESPONSIVE TO EXPOSURE TO ULTRA-VIOLET, DIRECTING RADIATIONS RICH IN ULTRA-VIOLET ONTO THE DEVELOPED NEGATIVE WHEREBY THE ULTRA-VIOLET BLOCKING AGENT IN THE NON-IMAGED PORTIONS OF THE NEGATIVE PREVENTS PASSGE OF SUFFICIENT AMOUNTS OF ULTRA-VIOLET THERETHROUGH FOR REACTION OF CORRESPONDING PORTIONS OF THE COATING ON THE OFFSET PLATE WHILE SUFFICIENT OF THE ULTRA-VIOLET RADIATION PASS THROUGH THE IMAGED PORRTIONS OF THE NEGATIVE FOR REACTION TO CONVERT THE CORRESPONDING PORTIONS OF THE COATING ON THE OFFSET PLATE OF A WATER REPELLENT, INK RECEPTIVE IMAGE CORRESPONDING TO THE ORIGINAL.