US4584232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam material sound absorption
Assignee: Illbruck GmbH
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Filing: 1984-01-20
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Granted: 1986-04-22
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Expires: 2004-01-20
Abstract
Abstract The present invention relates to a sound absorbing member comprising a fiber grid insert disposed between and bonded to two open cell foam panels.
Inventors
- 👤 Werner Frank
- 👤 Josef F. Irregeher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:59
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B32B5/00; B32B5/22; B32B5/32; B60; B60R; B60R13/00; B60R13/08; B60R13/0838; G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/168; B32B2307/00; B32B2307/10; B32B2307/102; B32B2307/70; B32B2307/724; B32B2605/00; B32B2605/08; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24496; Y10T428/24504; Y10T428/24595; Y10T428/24628; Y10T428/249921; Y10T428/249953; Y10T428/24996; Y10T428/249981; Y10T428/249982; Y10T428/249987; Y10T428/249988; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/15; Y10T442/20; Y10T442/25
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
64 words
A sound absorbing member comprising a first open cell foam panel, a second open cell foam panel, a fiber grid insert disposed between said panels, a bonding substance which bonds said grid fibers together and bonds said first and second panels to said grid insert, said panels being compacted under heat and pressure to provide an acoustical impedance of from 20 to 120 rayls.
Claim 2
Dependent Claim
64 words
A sound absorbing member comprising a first open cell foam panel, a second open cell foam panel, a fiber grid insert disposed between said panels, a bonding substance which bonds said grid fibers together and bonds said first and second panels to said grid insert, said panels being compacted under heat and pressure to provide an acoustical impedance of from 20 to 120 rayls.
Claim 3
Dependent Claim
15 words
The said absorbing member of claim 1 in which said acoustical impedance is 80 rayls.
Claim 4
Dependent Claim
36 words
The said absorbing member of claim 1 in which said sound absorbing member is of a non-planar configuration and said panels and said grid are formed into said non-planar configuration during compaction under heat and pressure.
Claim 5
Dependent Claim
20 words
The sound absorbing member of claim 3 in which said compaction under heat and pressure takes place only by zones.
Claim 6
Dependent Claim
34 words
The said sound absorbing member of claim 1 in which a skin is formed on the outer surface of one of said panels to provide the acoustical impedance of from 20 to 120 rayls.
Claim 7
Dependent Claim
49 words
The sound absorbing member of claim 1 in which a portion of the outer surface of the first panel is spaced from the plane of the marginal surface of said panel by a multiple of the panel thickness, and said marginal portion of said panel forms a bearing edge.
References Cited (Backward Citations)
CA780177A
Cited
US3072582A
Cited
DE1154923B
Cited
GB1510712A
Cited
FR2368111A1
Cited
DE2937389A1
Cited
US4347276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |