Patent ID: 7361593

Claim:
A method of forming an electrical connection, the method comprising the steps of: forming a via in a first circuit layer of a substrate; placing a first electrically conductive substance in said via so that the first electrically conductive substance is carried by the first circuit layer, the first electrically conductive substance being electrically connected with an element of the first circuit layer; placing a second electrically conductive substance on a second circuit layer of the substrate so that the second electrical substance is electrically connected with an element of the second circuit layer, the second electrically conductive substance being positioned proximate said first electrically conductive substance; and applying heat such that a physical relation between said first and second electrically conductive substances is altered, the first and second circuit layers being electrically connected to each other after the heat application, wherein said first electrically conductive substance comprises a pin fixed within said via and said second electrically conductive substance comprises a preformed washer having a hole, wherein said hole receives said pin and said washer melts to electrically connect the first and second circuit layers during said heating step.