Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1992-04-14
1994-04-19
Ryan, Patrick J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428161, 428172, 428323, 428338, 181290, 181284, B32B 900
Patent
active
053044150
ABSTRACT:
A sound absorptive material has powder particles having a sound absorption characteristics at a low frequency and generally supported in a vibratable state by a porous support, whereby the sound absorptive material can be increased in the sound absorption coefficient in the low frequency range while maintaining the absorptive material to be thin.
REFERENCES:
patent: 4113053 (1978-09-01), Matsumoto et al.
patent: 4386676 (1983-06-01), Gadde et al.
patent: 5164260 (1992-11-01), Yoshinaka et al.
Ando Hideyuki
Kurihara Yoshitaka
Nakai Takashi
Okudaira Yuzo
Umeoka Kazunori
Bahta Abraham
Matsushita Electric & Works Ltd.
Ryan Patrick J.
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