METHOD OF PREPARING DIE PLATES

• US 3,463,035 A
• Filed: 12/05/1966
• Issued: 08/26/1969
• Est. Priority Date: 12/05/1966
• Status: Expired due to Term

• Current Assignee: Wilfred Bright
• Original Assignee: Wilfred Bright
• Inventors: Bright, Wilfred
• Application Number:
  US04/599,080
• Time in Patent Office: 995 Days
• US Class Current: 76/107.1
• CPC Class Codes: B21D 37/20 Making tools by operations not covered by a single other subclass

Claims

1. A METHOD OF FORMING MATCHING DIE PLATES WHICH, WHEN MATED, HAVE AN INTERIOR CAVITY CONFORMING IN SHAPE TO AN OBJECT TO BE REPRODUCED, SAID METHOD COMPRISING THE STEPS OF (1) FORMING AN UNDERSIZED NEGATIVE IMPRESSION OF THE OBJECT TO BE REPROEUCED, (2) COVERING THE SURFACE OF SAID UNDERSIZED NEGATIVE IMPRESSION WITH A FIRST SHEET OF METALLIC MATERIAL HAVING A THICKNESS EQUAL TO THE AMOUNT BY WHICH SAID NEGATIVE IMPRESSION IS UNDERSIZED, AN ADJACENT SECOND SHEET OF MATERIAL HAVING A THICKNESS EQUAL TO THE THICKNESS OF SUCH OBJECT TO BE REPRODUCED AND AN ADJACENT THIRD SHEET OF MATERIAL, (3) DEFORMING SAID FIRST, SECOND AND THIRD SHEETS INTO CLOSE CONFORMING RELATION WITH SAID NEGATIVE IMPRESSION IN A MANNER SUCH THAT SAID FIRST SHEET DIRECTLY CONTACTS AND CONFORMS CLOSELY TO THE SURFACE CONTOUR OF SAID IMPRESSION WHEREBY, WHEN SAID SECOND SHEET IS REMOVED, SAID FIRST AND THIRD SHEETS, WHEN ADJACENT, WILL ENCLOSE AN INTERIOR CAVITY CONFORMING IN SHAPE TO SUCH OBJECT TO BE REPRODUCED.