Anti-eavesdropping window structure
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United States of America Patent
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May 16, 1989
Grant Date -
N/A
app pub date -
Apr 3, 1987
filing date -
Apr 4, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An anti-eavesdropping window structure in which the inner and outer panes, separated by a spacer frame have thickness d and D such that D/d is at least equal to 1.5. The space between the panes is filled with a gas mixture having a density in excess of that of air and a body-sound generator applied directly to the outer pane generates thermal noise over a frequency range of 200 to 3000 Hz to superimpose a level of such noise of at least 20 dB on transmitted sound.
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