| abstract |
A NOVEL PORDUCT OF RADICALLY INCREASED PHOTOGRAPHIC SPEED, PHOTOGRAPHIC DENSITY AND CONTRAST IS COMPRISED IN PART OF A SILVER IMAGE PRODUCED BY PHOTOGRAPHIC AND/OR OTHER READIATION TECHNIQUES, OR A SILVER IMAGE FORMED BY RADIATION AND HAVING SILVER ADDED THERETO BY PHYSICAL DEVELOPMENT WITH REAGENTS CONTAINING SILVER, OR A SILVER IMAGE PRODUCED BY ADDING SILVER TO A SELECT AREA THROUGH PHOTORESIST TECHNIQUES, AND/OR A SILVER IMAGE PRODUCED BY STENCIL AND PRINTING TECHNIQUES; AND PLATING THEREON IN ONLY THE SILVER IMAGE AREAS, METALS TAKEN FROM THE GROUP COMPRISING NICKEL, COBALT, IRON, COPPER, CHROMIUM, GOLD, SILVER, PLATINUM, AND PALLADIUM AND MIXTURES THEREOF. SILVER IMAGES ARE THE PREFERRED BASE AND NICKEL IS THE PREFERRED PLATING MATERIAL. HOWEVER, GOLD, PALLADIUM AND PLATINUM MAY BE USED AS THE BASE FOR THE SELECTIVE PLATING OF NICKEL OR THE OTHER METALS NOTED ABOVE. IN A USEFUL VARIATON OF THE INVENTION, ONE-SIDED AND/OR TWO-SIDED PLATED THROUGH CONDUCTIVE CIRCUIT BOARDS USEFUL FOR PRINTED CIRCUITS MAY BE PRODUCED BY THE TECHNIQUES OF THE INVENTION WITHOUT THE NEED FOR USE OF A PHOTORESIST. |