Patent US4830140A successfully refreshed from Google Patents.
US4830140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforated sound absorbing panel
Assignee: Protenna AB
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Filing: 1988-03-01
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Granted: 1989-05-16
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Expires: 2008-03-01
Abstract
Abstract A perforated panel having a thickness of at least about 6 mm, for use as a sound absorbing element, especially at lacunarias. Each perforation is covered by a thin fiber cloth which is bonded to the edges of the perforation, rendering said panel element a specific acoustic flow resistance of between 1200 and 4000 Nsm -3 .
Inventors
- 👤 Lars Fridh
- 👤 Stig Ingemansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:56
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/001; B; B32; B32B; B32B13/00; B32B13/14; B32B13/04; B32B13/08; B32B3/00; B32B3/26; B32B3/266; B32B7/00; B32B7/04; B32B7/12; B32B7/14; B32B2307/00; B32B2307/10; B32B2307/102; B32B2307/50; B32B2307/56
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
A sound absorbing element, comprising: a solid panel having a thickness of at least about 6 mm, a front sound-receiving side, a rear side opposing said front sound-receiving side, and a plurality of perforations extending through said panel from said front side to said rear side; and at least one thin fiber cloth which is bonded to said rear side of the panel at respective edges of each of said perforations so as to cover each of said perforations; wherein said sound absorbing element has a specific acoustic flow resistance of between 1200 and 4000 Nsm -3 .
Claim 2
Dependent Claim
98 words
A sound absorbing element, comprising: a solid panel having a thickness of at least about 6 mm, a front sound-receiving side, a rear side opposing said front sound-receiving side, and a plurality of perforations extending through said panel from said front side to said rear side; and at least one thin fiber cloth which is bonded to said rear side of the panel at respective edges of each of said perforations so as to cover each of said perforations; wherein said sound absorbing element has a specific acoustic flow resistance of between 1200 and 4000 Nsm -3 .
Claim 3
Dependent Claim
31 words
The sound absorbing element as claimed in claim 1, wherein a single fiber cloth covers the entire rear side of said panel and is bonded to the panel by a glue.
Claim 4
Dependent Claim
34 words
The sound absorbing element as claimed in claim 2, wherein said glue extends to the edges of said perforations, but does not extend over the portions of the fiber cloth which cover the perforations.
Claim 5
Dependent Claim
28 words
The sound absorbing element as claimed in claim 1, wherein said sound absorbing element has a specific acoustic flow resistance of between 1800 and 3500 Nsm -3 .
Claim 6
Dependent Claim
26 words
The sound absorbing element as claimed in claim 1, wherein the area of said perforations constitutes between 10 and 20% of the area of said panel.
Claim 7
Dependent Claim
16 words
The sound absorbing element as claimed in claim 1, wherein said panel is made of plasterboard.
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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) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |