Patent ID: 8174830

Claim:
A circuit board, comprising: a pump; a flexible substrate comprising: a base; a top coupled to the base; a channel formed by the base and a first side of the top; a liquid metal provided in the channel; and a coating provided on at least a portion of the channel; and a heat sink and circuitry both directly coupled to a second side of the top opposite the first side of the top; wherein the liquid metal is pumped through the channel by the pump and the coating reduces diffusion between the liquid metal and portions of the channel; wherein the pump is configured to vary the flow rate of the liquid metal through the pump based on current received from an adjustable current supply circuit; and wherein the channel is formed of substantially thermally non-conductive material to form a substantially non-thermally conductive channel such that the liquid metal receives heat from a heat producing device and carries the heat through the substantially non-thermally conductive channel to the heat sink.