Patent ID: 7487585

Claim:
method of manufacturing a metal-ceramic circuit board comprising: bonding a conductive metal member for an electric circuit on a first surface of a ceramic substrate board; placing a quantity of aluminum or an aluminum alloy in a furnace; placing said ceramic substrate board being bonded to said conductive metal member for the electric circuit in an inside bottom portion of the furnace such that a second surface of the ceramic surface board is facing outwardly from said inside bottom portion the second surface being generally opposed to said first surface having the conductive metal members bonded thereto; creating an inert gas atmosphere inside the furnace; melting the aluminum or aluminum alloy to form a molten metal; dispensing the molten metal via a narrow conduit onto said ceramic substrate board such that the molten metal is in direct contact with a second surface of said ceramic substrate board; and cooling said molten metal and said ceramic substrate board being bonded to said conductive metal member for the electric circuit to form a base plate of aluminum or aluminum alloy, which is bonded directly on the second surface of the ceramic substrate board.