Multi-metal planographic printing plates

Claim 1

A PLANOGRAPHIC PRINTING PLATE COMPRISING A BASE SHEET HAVING BONDED TO AT LEAST ONE THEREOF A NONGRAINED, SMOOTH METAL SUBLAYER FROM THE GROUP CONSISTING OF NON-POROUS NICKEL AND SOFT COPPER; A NON-GRAINED, NONPOROUS COPPER INK ADHERING LAYER BONDED TO SAID METAL SUBLAYER COMPOSED OF FINE, DENSELY PACKAGE CRYSTALS, SAID LAYER HAVING A HARD, INHERENTLY SMOOTH, NON-POROUS SURFACE; A HARD CHROMIUM LAYER BONDED TO SAID NON-GRAINED COPPER LAYER, SAID CHROMIUM LAYER BEING A NON-GRAINED CHROMIUM LAYER OF SUBSTANTIALLY UNIFORM THICKNESS AND COMPOSED OF FINE, DENSELY PACKED CRYSTALS AND HAVING A HARD, SMOOTH, SCRATCHPROOF, NON-POROUS SURFACE, WHEREBY SAID PLATE HAS SIGNIFICANTLY LONGER LIFE AND IS CAPABLE OF ACCURATE DOT STRUCTURE THAT PRODUCE HIGH FIDELITY PRINTING WITH FAITHFUL REPRODUCTION AND SHARP IMAGES UNIFORMLY THROUGHOUT PROLONGED PRINTING RUNS, WITHOUT ANY SHADOWING IN THE NON-PRINTING AREAS, AT LOWER INK AND WATER CONSUMPTION AND RESULTING IN LESS DOWN TIME OF THE PRINTING MACHINE.