Light transmitting panel

In a light transmitting panel composed of at least two panes and spacer means holding the panes in spaced relation to define an inter-pane space between adjacent panes, the improvement wherein, for imparting improved sound damping properties to said panel, at least two said panes have respectively different masses per unit light transmitting surface area, said inter-pane space is sealed from the atmosphere, and said panel comprises a gaseous medium filling said space and having a composition such that the velocity of sound propagation in said gaseous medium is between 30% and 95% of the velocity of sound propagation in dry air at the same pressure and temperature.

In a light transmitting panel composed of three panes and spacer means holding the panes in spaced relation to define two inter-pane spaces each between a respective pair of adjacent panes, the improvement wherein for imparting improved sound damping properties to said panel, at least two said panes have respectively different masses per unit light transmitting surface area, each said inter-pane space is sealed from the atmosphere, and said panel comprises a respective gaseous medium filling each said space, the composition of the gaseous medium in one said space being such that the velocity of sound propagation therein at a given temperature and pressure is between 30 and 95% of that in dry air at the same pressure and temperature and the composition of the gaseous medium in the other said space being such that the velocity of sound propagation therein at a given temperature and pressure is at least 1.2 times that in dry air at the same pressure and temperature.

In a light transmitting panel composed of at least two panes and spacer means holding the panes in spaced relation to define an inter-pane sapce between adjacent panes, the improvement wherein, for imparting improved sound damping properties to said panel, at least two said panes have respectively different masses per unit light transmitting surface area, and said inter-pane space is sealed from the atmosphere, and said panel comprises a gaseous medium filling said space and composed of two ingredients, the composition of one of said ingredients being such that the velocity of sound propagation therein at a given temperature and pressure is at least 1.2 times the velocity of sound propagation in dry air at the same pressure and temperature, and the composition of the other one of said ingredients being such that the velocity of sound propagation therein at a given temperature and pressure is between 30 and 95% of the velocity of sound propagation in dry air at the same pressure and temperature.