Acoustics – Sound-modifying means – Housing or enclosure
Reexamination Certificate
2007-04-10
2007-04-10
Donovan, Lincoln (Department: 2837)
Acoustics
Sound-modifying means
Housing or enclosure
C181S290000, C181S286000, C181S294000, C180S069220, C180S069230, C296S039300
Reexamination Certificate
active
10503975
ABSTRACT:
A soundproofing assembly intended, in particular, to soundproof a motor vehicle. The inventive assembly includes four stacked layers, consisting respectively of: a first layer having an air resistance of between 500 and 2,000 N·m−3.s; a second porous, acoustic spring-type layer having a resistivity of between 10,000 N·m−4.s and 50,000 N·m−4.s; a third viscoelastic, airtight, heavy mass-type layer having a density that is greater than or equal to 1,500 Kg/m3 and a surface density of between 0.2 Kg/m2 and 9 Kg/m2; and a fourth porous, acoustic spring-type layer having a resistivity of between 10,000 N·m−4.s and 50,000 N·m−4.s.
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Deshayes Guillaume
Duval Arnaud
Donovan Lincoln
Faurecia Automotive Industrie
Phillips Forrest
Young & Thompson
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