Patent ID: 7275663

Claim:
A dispensing device for dispensing a viscous product that is adapted to be driven by a plurality of pressurized gas cartridges, the dispensing device comprising: a manifold having a plurality of inlet passages, each of the plurality of inlet passages providing fluid communication between an inlet and an outlet passage; a housing adapted to retain a pressurized gas cartridge in sealed fluid communication with each of the plurality of inlet passages; and a check valve in at least one of the plurality of inlet passages, the check valve being biased to a closed position that prevents gas from flowing through the check valve to the inlet of the at least one of the plurality of inlet passages; wherein the dispensing device is adapted to use gas delivered through the outlet passage from the plurality of pressurized gas cartridges to dispense the viscous product from the dispensing device; and wherein the housing is further adapted to retain a reserve gas cartridge in a non-use position, the non-use position being a position in which the gas cartridge is not sealingly engaged with any one of the inlets.