Method of making composite structure of plastic, especially forming die

Claim 1

A METHOD OF MAKING A PLASTIC DIE BY BONDING A CAST PLASTIC BACKING TO A BUILT-UP REINFORCED PLASTIC SHELL COMPRISING, APPLYING A FLOW RESISTANT THIN UNIFORM THICKNESS WEAR RESISTING FILLED PLASTIC FACING LAYER OVER A MOLD SURFACE, ALLOWING SAID FACING LAYER TO SELF HARDEN IN THE OPEN ATMOSPHERE, REINFORCING SAID FACING LAYER BY BUILDING UP A LAMINAR LAYER OF THERMOSETTING PLASTIC AND REINFORCING BINDER ONTO SAID FACING LAYER, ALLOWING SAID BUILT-UP LAMINAR LAYER TO SELF HARDEN, PLACING A THIN PARTING FILM OVER THE BUILT-UP AND CURED LAMINAR LAYER, GATE OVER SAID THIN PARTING FILM TO FORM A CASTING, AND ALLOWING SAID BACKING TO SELF CURE HAVING THE SHAPE OF SAID LAMINAR LAYER, REMOVING SAID CURED CAST BACKING FROM SAID LAMINAR LAYER, REMOVING SAID PARTING FILM FROM SAID CAST BACKING, PLACING A MASS OF LIQUID THERMOSETTING PLASTIC ONTO SAID LAMINAR LAYER, LACING SAID CAST BACKING ONTO SAID MASS OF THERMOSETTING PLASTIC ON SAID LAMINAR LAYER, AND SUPPORTING SAID BACKING SO THAT SAID LIQUID THERMOSETTING PLASTIC MASS OCCUIES THE SPACE FORMERLY OCCUPIED BY SAID PARTING FILM, ALLOWING SAID THERMOSETTING PLASTIC MASS OF SELF CURE BETWEEN SAID BACKING AND SAID LAMINAR LAYER AS A THIN BONDING FILM, AND REMOVING SAID PLASTIC DIE FROM SAID MOLD SURFACE.

Claim 2

A METHOD OF MAKING A PLASTIC DIE BY BONDING A CAST PLASTIC BACKING TO A BUILT-UP REINFORCED PLASTIC SHELL COMPRISING, APPLYING A FLOW RESISTANT THIN UNIFORM THICKNESS WEAR RESISTING FILLED PLASTIC FACING LAYER OVER A MOLD SURFACE, ALLOWING SAID FACING LAYER TO SELF HARDEN IN THE OPEN ATMOSPHERE, REINFORCING SAID FACING LAYER BY BUILDING UP A LAMINAR LAYER OF THERMOSETTING PLASTIC AND REINFORCING BINDER ONTO SAID FACING LAYER, ALLOWING SAID BUILT-UP LAMINAR LAYER TO SELF HARDEN, PLACING A THIN PARTING FILM OVER THE BUILT-UP AND CURED LAMINAR LAYER, GATE OVER SAID THIN PARTING FILM TO FORM A CASTING, AND ALLOWING SAID BACKING TO SELF CURE HAVING THE SHAPE OF SAID LAMINAR LAYER, REMOVING SAID CURED CAST BACKING FROM SAID LAMINAR LAYER, REMOVING SAID PARTING FILM FROM SAID CAST BACKING, PLACING A MASS OF LIQUID THERMOSETTING PLASTIC ONTO SAID LAMINAR LAYER, LACING SAID CAST BACKING ONTO SAID MASS OF THERMOSETTING PLASTIC ON SAID LAMINAR LAYER, AND SUPPORTING SAID BACKING SO THAT SAID LIQUID THERMOSETTING PLASTIC MASS OCCUIES THE SPACE FORMERLY OCCUPIED BY SAID PARTING FILM, ALLOWING SAID THERMOSETTING PLASTIC MASS OF SELF CURE BETWEEN SAID BACKING AND SAID LAMINAR LAYER AS A THIN BONDING FILM, AND REMOVING SAID PLASTIC DIE FROM SAID MOLD SURFACE.