Patent ID: 7774997

Claim:
System ( 1 ) operable in a valveless mode, comprising a glazing element ( 2 ) and a gas supply device ( 4 ), wherein the glazing element ( 2 ) comprises at least two substrates ( 18 , 19 ), which enclose an intermediate space ( 3 ), and at least one gas disposed in the intermediate space ( 3 ) with a defined composition, a coating comprising at least one electrochromic layer being applied at least on one face of a substrate ( 18 , 19 ) which is orientated towards the intermediate space ( 3 ), the physical properties of which coating comprising optical and/or electrical properties are alterable dependent upon the composition of the gas, the at least one electrochromic layer comprising oxides of transition metals which are selected from the group of materials consisting of iridium oxide, manganese oxide, cobalt oxide, niobium oxide, nickel oxide, or electrochromic polymers, the gas supply device ( 4 ) comprises at least one electrolysis device, a working electrode ( 9 ), a counterelectrode ( 10 ) and at least one electrolyte ( 17 ) in order to produce gas, the glazing element ( 2 ) and the gas supply device ( 4 ) are connected to each other such that the gas is guidable in a closed circulation ( 6 ) between the glazing element ( 2 ) and the gas supply device ( 4 ), at least one pump ( 5 ) being disposed in the system ( 1 ) for producing a directed gas flow ( 8 , 14 ) in the closed circulation ( 6 ), means for influencing a moisture content of the gas are disposed in the system, means comprising an inert gas accumulator being connected to said gas supply device ( 4 ) for diluting the gas which is producible in the gas supply device ( 4 ) with an inert gas, which is selected from the group consisting of nitrogen, helium, neon, argon, krypton, or xenon, and wherein the concentration of the gas which is producible in the gas supply device ( 4 ), is adjustable by supplying said inert gas at below 5%, relative to the total volume of the gas mixture.