发明名称 |
Anti-eavesdropping window structure |
摘要 |
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.
|
申请公布号 |
US4829729(A) |
申请公布日期 |
1989.05.16 |
申请号 |
US19870035542 |
申请日期 |
1987.04.03 |
申请人 |
FLACHGLAS AKTIENGESELLSCHAFT |
发明人 |
DERNER, PAUL;REICHMANN, PETER |
分类号 |
G10K15/00;E04B1/82;E06B3/67;E06B5/20;G10K11/178 |
主分类号 |
G10K15/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|