(WO9745298-A1)      Gas generator, preferably for a vehicle air-bag, consists of a vessel (4) containing a combustible gas mixture and a seal (3, 11), opening into a combustion chamber (10), with a gas outlet (14), in which the gas mixture is ignited by an igniter. The vessel (4) is filled mainly with an inert gas under pressure, which contains 0.1-2.0 vol.% hydrocarbon and 0.5-10 vol.% gaseous oxidant. On initiation, the igniter opens the seal (11), ignites the gas mixture in the combustion chamber (10) and maintains combustion by continuous supply of energy.    ADVANTAGE -   A gas generator containing a liquid mixture of hydrocarbons and dinitrogen monoxide (N2O) gives an explosive reaction, which can destroy the combustion chamber. This can be moderated by adding inert gas but the liquefied gas must be vaporised, which requires extra energy and takes times. The high content of fuel gas also results in a very high temperature of the combustion gas, which is an added danger if it leaks. The gas-filled generator responds rapidly after initiation and gives a controlled stream of compressed gas at a lower temperature (e.g. 400C or less), which makes it safer.    (EP901434-A1)      Gas generator, preferably for a vehicle air-bag, consists of a vessel (4) containing a combustible gas mixture and a seal (3, 11), opening into a combustion chamber (10), with a gas outlet (14), in which the gas mixture is ignited by an igniter. The vessel (4) is filled mainly with an inert gas under pressure, which contains 0.1-2.0 vol.% hydrocarbon and 0.5-10 vol.% gaseous oxidant. On initiation, the igniter opens the seal (11), ignites the gas mixture in the combustion chamber (10) and maintains combustion by continuous supply of energy.    ADVANTAGE -   A gas generator containing a liquid mixture of hydrocarbons and dinitrogen monoxide (N2O) gives an explosive reaction, which can destroy the combustion chamber. This can be moderated by adding inert gas but the liquefied gas must be vaporised, which requires extra energy and takes times. The high content of fuel gas also results in a very high temperature of the combustion gas, which is an added danger if it leaks. The gas-filled generator responds rapidly after initiation and gives a controlled stream of compressed gas at a lower temperature (e.g. 400C or less), which makes it safer.    (DE19621045-C2)      Gas generator, preferably for a vehicle air-bag, consists of a vessel (4) containing a combustible gas mixture and a seal (3, 11), opening into a combustion chamber (10), with a gas outlet (14), in which the gas mixture is ignited by an igniter. The vessel (4) is filled mainly with an inert gas under pressure, which contains 0.1-2.0 vol.% hydrocarbon and 0.5-10 vol.% gaseous oxidant. On initiation, the igniter opens the seal (11), ignites the gas mixture in the combustion chamber (10) and maintains combustion by continuous supply of energy.    ADVANTAGE -   A gas generator containing a liquid mixture of hydrocarbons and dinitrogen monoxide (N2O) gives an explosive reaction, which can destroy the combustion chamber. This can be moderated by adding inert gas but the liquefied gas must be vaporised, which requires extra energy and takes times. The high content of fuel gas also results in a very high temperature of the combustion gas, which is an added danger if it leaks. The gas-filled generator responds rapidly after initiation and gives a controlled stream of compressed gas at a lower temperature (e.g. 400C or less), which makes it safer.    (JP2000511485-W)      Gas generator, preferably for a vehicle air-bag, consists of a vessel (4) containing a combustible gas mixture and a seal (3, 11), opening into a combustion chamber (10), with a gas outlet (14), in which the gas mixture is ignited by an igniter. The vessel (4) is filled mainly with an inert gas under pressure, which contains 0.1-2.0 vol.% hydrocarbon and 0.5-10 vol.% gaseous oxidant. On initiation, the igniter opens the seal (11), ignites the gas mixture in the combustion chamber (10) and maintains combustion by continuous supply of energy.    ADVANTAGE -   A gas generator containing a liquid mixture of hydrocarbons and dinitrogen monoxide (N2O) gives an explosive reaction, which can destroy the combustion chamber. This can be moderated by adding inert gas but the liquefied gas must be vaporised, which requires extra energy and takes times. The high content of fuel gas also results in a very high temperature of the combustion gas, which is an added danger if it leaks. The gas-filled generator responds rapidly after initiation and gives a controlled stream of compressed gas at a lower temperature (e.g. 400C or less), which makes it safer.