Acoustics – Sound-modifying means – Sound absorbing panels
Reexamination Certificate
2000-06-02
2001-10-02
Dang, Khanh (Department: 2837)
Acoustics
Sound-modifying means
Sound absorbing panels
C181S286000
Reexamination Certificate
active
06296075
ABSTRACT:
TECHNICAL FIELD
This invention relates to acoustical systems.
BACKGROUND ART
The use of a permeable facing fabric or film on an acoustical absorber to improve its low frequency response has been shown in the literature and in numerous commercial applications, primarily in the building and construction field. Recently this concept has been applied to motor vehicle interior acoustical products. While these arrangements may demonstrate improved sound transmission loss in the mid-frequency range as compared to a double-walled system, they also typically exhibit decreased sound transmission loss at higher frequencies. Furthermore, a porous surface may cause several practical problems. When used on the floor of a motor vehicle, an acoustical absorber having a water-permeable facing is susceptible to water intrusion which may cause formation of mildew and odor in the underpad, as well as rust the floor pan in some cases.
DISCLOSURE OF INVENTION
This invention provides an improved acoustical system comprising a water-impermeable layer and an underlayment. The underlayment is adjacent to the impermeable layer, and includes a first fibrous layer and a second fibrous layer. The first fibrous layer has a density less than the density of the second fibrous layer, and the underlayment has an airflow resistance between about 2000 and about 5000 mks Rayls.
Accordingly, it is an object of the present invention to provide an improved acoustical system which functions sufficiently over a broad frequency range. Another object of the present invention is to provide an improved acoustical barrier which is not susceptible to water intrusion.
These and other objects, features, and advantages of the present invention are readily apparent from the following detailed description of the best modes for carrying out the invention when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 3948347 (1976-04-01), Rutledge
patent: 4508774 (1985-04-01), Grabhoefer
patent: 4741945 (1988-05-01), Brant
patent: 4838524 (1989-06-01), McKeown
patent: 5258585 (1993-11-01), Juriga
patent: 5334338 (1994-08-01), Kittel
patent: 5459291 (1995-10-01), Haines
patent: 5536556 (1996-07-01), Juriga
patent: 5549776 (1996-08-01), Juriga
patent: 5565259 (1996-10-01), Juriga
patent: 5684278 (1997-11-01), Yasukawa et al.
patent: 5824973 (1998-10-01), Haines
patent: 5866235 (1999-02-01), Fredrick
patent: 5892187 (1999-04-01), Patrick
patent: 0 229 977 A2 (1987-07-01), None
patent: 0 732 684 A2 (1996-09-01), None
patent: 2 163 388 A (1986-02-01), None
Boyles David
Ebbitt Gordon
Gish Laura E.
Huang Liangyu
Wyerman Barry
Brooks & Kushman P.C.
Dang Khanh
Lear Corporation
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