NOVELTY - A microfluidic fuel cell system comprises polyimide layers, a membrane electrode assembly layer comprising an electrolyte sandwiched between an anode and a cathode, an electrical feedthrough extending through all layers, and a fuel feedthrough extending through at least four of the layers to form a bonded polyimide microfluidic fuel cell system.    USE - For use with fuel cells.    ADVANTAGE - The system controls the delivery of gas or liquid to the membrane electrode assembly. The polyimide laminate microfluidic structure provides structural support for the fuel cell membrane and creates a tight seal around the periphery of the MEA.    DETAILED DESCRIPTION - A microfluidic fuel cell system comprises polyimide layers, a membrane electrode assembly (MEA) layer comprising an electrolyte (109) sandwiched between an anode (104) and a cathode (110), an electrical feedthrough extending through all layers, and a fuel feedthrough extending through at least four of the layers to form a bonded polyimide microfluidic fuel cell system. The first polyimide layer contains at least one resistive heater (106). The second polyimide layer contains at least one microfluidic channel. The third polyimide layer contains at least anode manifold having a flowing mechanism for a fuel to flow to an anode. The fourth polyimide layer contains a cathode manifold having removing mechanism for removing reaction by-products from the cathode. An INDEPENDENT CLAIM is also included for a process comprising patterning polyimide preform layers; bonding a portion of the polyimide preform layers together; positioning an MEA layer (102) containing an MEA onto the bonded portion of polyimide preform layers; positioning the remainder of the perform layers onto the MEA; and curing to form a bonded polyimide microfluidic fuel cell system. The bonded polyimide microfluidic fuel cell system has a mechanism to electrically connect all layers.    DESCRIPTION OF DRAWING(S) - The figure shows an expanded 3-dimensional layout of a microfluidic fuel cell system.    MEA layer (102)    Anode (104)    Resistive heater (106)    Electrolyte (109)    Cathode (110)