(EP865516-A1)      The electrolytic cell has an end-anode (A1) and an end-cathode (K5) between which are a number of outer cells (E1,E5) with a series of bipolar cells (E2-E4) to which they are electrically joined. Each cell (E1-E5) incorporates one or two gas diffusion electrode(s) (11). One electrode forms both the roof (8) of the electrolyte chamber below and the floor of the electrolyte chamber above. They also form the end-anode (A1) and the anodes (A2-A4) of the bipolar cell elements (E2-E4) of a perforated, good electrically-conducting electrode structure (9) made e.g. of nickel (Ni). Each electrolyte chamber (8) discharges electrolyte and a reaction gas such as oxygen, and a mixture of electrolyte and the resulting product, and reaction gas is drawn off from each electrolyte chamber respectively. Cells (E1-E5) are grouped together in a stack, and the end-cathode (K5) and the cathodes (K2-K4) of the bipolar cell elements (E2-E5) incorporate a perforated electrically-conducting separation wall (10), on each of which is a gas diffusion electrode (11). The overflows on the respective upper cells (E1-E4) are height-adjustable.    USE -   Used for the electrolytic refinement of metal such as copper (Cu) and zinc (Zn), or as a fuel cell, or for the Hydrina process of cracking sodium sulphate.    ADVANTAGE -   The overflow weirs ensure that at no point in the cell does the hydrostatic pressure exceed the penetration resistance of e.g. the carbon cloth serving as the gas diffusion electrode. The interval between the hydrostatic pressure from the penetration resistance in the gas diffusion electrolysis can be selected such that the gas flows through succeeding cells at reduced pressure, improving the gas yield. ()    (EP865516-B1)      The electrolytic cell has an end-anode (A1) and an end-cathode (K5) between which are a number of outer cells (E1,E5) with a series of bipolar cells (E2-E4) to which they are electrically joined. Each cell (E1-E5) incorporates one or two gas diffusion electrode(s) (11). One electrode forms both the roof (8) of the electrolyte chamber below and the floor of the electrolyte chamber above. They also form the end-anode (A1) and the anodes (A2-A4) of the bipolar cell elements (E2-E4) of a perforated, good electrically-conducting electrode structure (9) made e.g. of nickel (Ni). Each electrolyte chamber (8) discharges electrolyte and a reaction gas such as oxygen, and a mixture of electrolyte and the resulting product, and reaction gas is drawn off from each electrolyte chamber respectively. Cells (E1-E5) are grouped together in a stack, and the end-cathode (K5) and the cathodes (K2-K4) of the bipolar cell elements (E2-E5) incorporate a perforated electrically-conducting separation wall (10), on each of which is a gas diffusion electrode (11). The overflows on the respective upper cells (E1-E4) are height-adjustable.    USE -   Used for the electrolytic refinement of metal such as copper (Cu) and zinc (Zn), or as a fuel cell, or for the Hydrina process of cracking sodium sulphate.    ADVANTAGE -   The overflow weirs ensure that at no point in the cell does the hydrostatic pressure exceed the penetration resistance of e.g. the carbon cloth serving as the gas diffusion electrode. The interval between the hydrostatic pressure from the penetration resistance in the gas diffusion electrolysis can be selected such that the gas flows through succeeding cells at reduced pressure, improving the gas yield. ()    (US6110334-A)      The electrolytic cell has an end-anode (A1) and an end-cathode (K5) between which are a number of outer cells (E1,E5) with a series of bipolar cells (E2-E4) to which they are electrically joined. Each cell (E1-E5) incorporates one or two gas diffusion electrode(s) (11). One electrode forms both the roof (8) of the electrolyte chamber below and the floor of the electrolyte chamber above. They also form the end-anode (A1) and the anodes (A2-A4) of the bipolar cell elements (E2-E4) of a perforated, good electrically-conducting electrode structure (9) made e.g. of nickel (Ni). Each electrolyte chamber (8) discharges electrolyte and a reaction gas such as oxygen, and a mixture of electrolyte and the resulting product, and reaction gas is drawn off from each electrolyte chamber respectively. Cells (E1-E5) are grouped together in a stack, and the end-cathode (K5) and the cathodes (K2-K4) of the bipolar cell elements (E2-E5) incorporate a perforated electrically-conducting separation wall (10), on each of which is a gas diffusion electrode (11). The overflows on the respective upper cells (E1-E4) are height-adjustable.    USE -   Used for the electrolytic refinement of metal such as copper (Cu) and zinc (Zn), or as a fuel cell, or for the Hydrina process of cracking sodium sulphate.    ADVANTAGE -   The overflow weirs ensure that at no point in the cell does the hydrostatic pressure exceed the penetration resistance of e.g. the carbon cloth serving as the gas diffusion electrode. The interval between the hydrostatic pressure from the penetration resistance in the gas diffusion electrolysis can be selected such that the gas flows through succeeding cells at reduced pressure, improving the gas yield. ()