Printed circuitry laminates and production thereof

Claim 1

A METHOD FOR PRODUCING THERMOSET RESINOUS LAMINATES HAVING PATTERN AREAS OF THIN SHEET METAL EMBEDDED IN AT LEAST ONE SURFACE THEREOF, WHICH COMPRISES: FEEDING A STRIP OF THIN SHEET METAL IN THE DIRECTION OF ITS LENGTH WHILE PROGRESSIVELY APPLYING TO ONE SURFACE THEREOF A SELFSUPPORTING, FIRMLY ADHERING FILM OF PLASTIC MATERIAL, PROGRESSIVELY APPLYING TO THE OPPOSITE SURFACE THEREOF A COATING OF A PHOTO-SENSITIVE RESIST, LIGHT SENSITIZING SAID PHOTO-SENSITIVE RESIST IN ACCORDANCE WITH SAID PATTERN AREAS AT LONGITUDINALLY SPACED INTERVALS ALONG SAID STRIP, DEVELOPING SAID LIGHT SENSITIZED PATTERN AREAS OF SAID RESIST, THEREAFTER ETCHING AWAY ALL PORTIONS OF SAID METAL STRIP EXCEIPT THE PATTERN AREAS COVERED BY SAID RESIST, THUS TO PRODUCE A WEB OF SAID PLASTIC FILM HAVING SAID METAL PATTERN AREAS ADHERING THERETO, CURRING SAID FILM WEB INTO LENGTHS CORRESPONDING TO SAID SUCCESSIVE PATTERN AREAS, SUPERIMPOSING A LENGTH OF THE FILM WEB SO CUT, WITH THE METAL PATTERN EXPOSED, ONTO A STACKED ASSEMBLY OF SHEETS OF FIBROUS MATERIAL IMPREGNATED WITH A THERMOSETTING RESIN, AND HOT PRESSING SAID ASSEMBLY AND SUPERIMPOSED LENGTH OF FILM BETWEEN PLATENS TO CONSOLIDATE THE SAME INTO A UNITARY, THEREMOSET LAMINATE HAVING SAID METAL PATTERN EMBEDDED FLUSH WITH THE LAMNATE IN A SURFACE THEREOF.