US5493081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panel that absorbs acoustic energy at low, medium and high frequencies, particularly at frequencies ranging from 400 Hz to 5,000 Hz
Assignee: Motus Holdings BV
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Filing: 1994-07-29
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Granted: 1996-02-20
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Expires: 2014-07-29
Abstract
Abstract A panel absorbing acoustical energy at low, medium and high frequencies, particularly at frequencies ranging from 400 Hz to 5,000 Hz, is essentially constituted by a plate (1) of semi-rigid foam with open communicating cells and by a layer (2) of bonded fibers or by a flexible cellular material. The assembly acts according to a mass-spring principle. The plate (1) of semi-rigid foam with open communicating cells constitutes the mass of the assembly functioning according to the mass-spring principle, while the layer (2) of bonded fibers or of flexible cellular material constitutes the spring of this assembly. The foam comprising the plate (1) is preferably a semi-rigid polyurethane foam of a density ranging from 20 kg/m 3 to 50 Kg/m 3 , of a thickness comprised between 5 mm and 15 mm and whose permeability to air is comprised between 5 liters per minute and 45 liters per minute for a specimen 80 mm in diameter. The layer (2) constituting the spring has a stiffness ranging from 0.007 MPa to 0.05 MPa and a thickness ranging from 4 mm to 10 mm.
Inventors
- 👤 Alain Manigold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:54
CPC Classifications
B; B62; B62D; B62D29/00; G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/168; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B2001/8457; E04B2001/8461; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
A panel absorbing acoustical energy at low, medium and high frequencies ranging from 400 Hz to 5,000 Hz, which comprises a plate (1) of semi-rigid foam with open communicating cells and a layer (2) of bonded fibers or a flexible cellular material superposed on and secured to said plate (1) to form an assembly, the assembly acting according to a mass-spring principle, or wherein the foam of the plate (1) is a semi-rigid polyurethane foam of a density ranging from 20 Kg/m 3 to 50 Kg/M 3 , of a thickness ranging from 5 mm to 15 mm and whose permeability to air ranges from 5 liters per minute to 45 liters per minute for a specimen 80 mm in diameter.
Claim 2
Dependent Claim
121 words
A panel absorbing acoustical energy at low, medium and high frequencies ranging from 400 Hz to 5,000 Hz, which comprises a plate (1) of semi-rigid foam with open communicating cells and a layer (2) of bonded fibers or a flexible cellular material superposed on and secured to said plate (1) to form an assembly, the assembly acting according to a mass-spring principle, or wherein the foam of the plate (1) is a semi-rigid polyurethane foam of a density ranging from 20 Kg/m 3 to 50 Kg/M 3 , of a thickness ranging from 5 mm to 15 mm and whose permeability to air ranges from 5 liters per minute to 45 liters per minute for a specimen 80 mm in diameter.
Claim 3
Dependent Claim
47 words
A panel according to claim 1, wherein the plate (1) of semi-rigid foam with open communicating cells constitutes the mass of the assembly functioning according to the mass-spring principle, while the layer (2) of bonded fibers or of flexible cellular material constitutes the spring of this assembly.
Claim 4
Dependent Claim
32 words
A panel according to claim 1, wherein the layer (2) forming the spring is a cellular material selected from the group consisting of flexible polyurethane foam, latex foam rubber and foam rubber.
Claim 5
Dependent Claim
16 words
A panel according to claim 1, wherein the layer (2) forming a spring is bonded fibers.
Claim 6
Dependent Claim
104 words
A panel absorbing acoustical energy at low, medium and high frequencies ranging from 400 Hz to 5,000 Hz, which comprises a plate (1) of semi-rigid foam with open communicating cells and a layer (2) of bonded fibers or a flexible cellular material superposed on and secured to said plate (1) to form an assembly, the assembly acting according to a mass-spring principle, or wherein the layer (2) constituting the spring and formed by a sheet of bonded fibers or by a flexible cellular material, has a stiffness ranging from 0.007 MPa to 0.05 MPa and a thickness ranging from 4 mm to 10 mm.
Claim 7
Dependent Claim
104 words
A panel absorbing acoustical energy at low, medium and high frequencies ranging from 400 Hz to 5,000 Hz, which comprises a plate (1) of semi-rigid foam with open communicating cells and a layer (2) of bonded fibers or a flexible cellular material superposed on and secured to said plate (1) to form an assembly, the assembly acting according to a mass-spring principle, or wherein the layer (2) constituting the spring and formed by a sheet of bonded fibers or by a flexible cellular material, has a stiffness ranging from 0.007 MPa to 0.05 MPa and a thickness ranging from 4 mm to 10 mm.
Claim 8
Dependent Claim
32 words
A panel according to claim 5, wherein the layer (2) forming the spring is a cellular material selected from the group consisting of flexible polyurethane foam, latex foam rubber and foam rubber.
Claim 9
Dependent Claim
16 words
A panel according to claim 5, wherein the layer (2) forming a spring is bonded fibers.
Claim 10
Dependent Claim
101 words
A panel absorbing acoustical energy at low, medium and high frequencies ranging from 400 Hz to 5,000 Hz, which comprises a plate (1) of semi-rigid foam with open communicating cells and a layer (2) of bonded fibers or a flexible cellular material superposed on and secured to said plate (1) to form an assembly, the assembly acting according to a mass-spring principle, or wherein said layer (2) is 40% to 80% of polyester fibers having a titre ranging from 4 decitex to 20 decitex, and 20% to 60% of thermofusible fibers having a titre ranging from 4 decitex to 20 decitex.
Claim 11
Dependent Claim
101 words
A panel absorbing acoustical energy at low, medium and high frequencies ranging from 400 Hz to 5,000 Hz, which comprises a plate (1) of semi-rigid foam with open communicating cells and a layer (2) of bonded fibers or a flexible cellular material superposed on and secured to said plate (1) to form an assembly, the assembly acting according to a mass-spring principle, or wherein said layer (2) is 40% to 80% of polyester fibers having a titre ranging from 4 decitex to 20 decitex, and 20% to 60% of thermofusible fibers having a titre ranging from 4 decitex to 20 decitex.
Claim 12
Dependent Claim
33 words
A panel according to claim 8, wherein the layer (2) is about 70% polyester fibers having a titre of 6.7 decitex and about 30% of thermofusible fibers having a titre of 4 decitex.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-19 | 1999-08-21 | 2000-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-19 | 2003-08-21 | 2004-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-19 | 2007-08-21 | 2008-02-20 | $7700.00 | Window Closed / Lapsed |