Gaseous mixture comprises helium oxygen and nitrogen, useful for the inflation of baudruche balloons intended for play purposes

摘要

Gaseous mixture of a density less than that of air comprises 70 - 80% of helium, 18 - 24% of oxygen and 1 - 7% of nitrogen ; the sum of the volumetric proportions of the components is greater or equal to 95% of the total volume. Independent claims are also included for a hermetic envelope filled with the composition, and the use and preparation of the composition.