Process for making metallic structure

Claim 1

A PROCESS FOR MAKING A METALLIC STRUCTURE WITH A WALL HAVING A MULTIPLICITY OF ORIFICES OPENING ONTO AN EXPOSED SURFACE OF SAID WALL, SAID ORIFICES INCLUDING A FIRST GROUP OF ORIFICES TERMINATING AT A MANIFOLD WITHIN SAID STRUCTURE AND A SECOND GROUP OF ORIFICES TERMINATING BEYOND SAID MANIFOLD, COMPRISING THE STEPS OF: PROVIDING A BASE WITH A MULTIPLICITY OF FIRST AND SECOND PINS PROJECTING THEREFROM; ELECTROFORMING A FIRST METALLIC LAYER ON SAID BASE AROUND ALL SAID PINS WHICH THE LATTER PROJECTING ON BOTH SIDES OF SAID LAYER; TRIMMING SAID FIRST PINS TO THE LEVEL OF AN EXPOSED SURFACE OF SAID FIRST METALLIC LAYER; DEPOSITING A DESTRUCTIBLE MASKING LAYER ON SAID EXPOSED SURFACE TO A DEPTH LESS THAN THE LENTH OF THE PROJECTING PORTIONS OF SAID SECOND PINS, SAID MASKING LAYER HAVING APERTURES CENTERED ON BUT WIDER THAN SAID SECOND PINS; ELECTROFORMING A SECOND METALLIC LAYER ON SAID MASKING LAYER AROUND THE TIPS OF SAID PROJECTING PORTIONS OF SAID SECOND PINS, SAID LAYER BEING FORMED INTEGRAL WITH TUBULAR BOSSES EXTENDING THROUGH SAID APERTURES AROUND SAID SECOND PIN INTO FIRM CONTACT WITH SAID FIRST METALLIC LAYER; REMOVING SAID BASE AND SAID PINS; AND DESTROYING SAID MAKSING LAYER, THEREBY LEAVING A MANIFOLD SPACE COMMUNICATING WITH ORIFICES LEFT IN SAID FIRST METALLIC LAYER UPON WITHDRAWAL OF SAID FIRST PINS.