US4441580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustical control media
Assignee: Steelcase Development Inc
•
Filing: 1980-10-17
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Granted: 1984-04-10
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Expires: 2000-10-17
Abstract
Abstract An acoustical control media includes an air impervious septum adjacent which there is positioned a relatively thick layer of low density filler material on the outside of which there is provided a relatively thin panel of medium density perforated material. The acoustical media so formed can be used in acoustical panels employed to separate work areas in an office and in such applications decorative coverings can be provided over the perforated layer. The structure so formed provides improved broad bandwidth absorption of acoustical energy.
Inventors
- 👤 Michael P. Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:37
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/74; E04B2/7407; E04B2/7409; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/8227; E04B1/84; E04B2001/8423; E04B2001/8433; E04B2001/8452; E04B2001/8457; E04B2001/8461; E04B2001/8476; E04B2001/848
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
80 words
An acoustical panel comprising: a septum made of an air impervious material; a layer of low density sound absorbing material positioned adjacent to an exterior side of said septum, and constructed to absorb sound waves therein; and a layer of medium density material positioned adjacent to an exterior side of said low density layer, and constructed to absorb sound waves therein for absorption-type sound attenuation; said layer of medium density material having perforations extending laterally therethrough for Helmholtz-type sound attenuation.
Claim 2
Dependent Claim
80 words
An acoustical panel comprising: a septum made of an air impervious material; a layer of low density sound absorbing material positioned adjacent to an exterior side of said septum, and constructed to absorb sound waves therein; and a layer of medium density material positioned adjacent to an exterior side of said low density layer, and constructed to absorb sound waves therein for absorption-type sound attenuation; said layer of medium density material having perforations extending laterally therethrough for Helmholtz-type sound attenuation.
Claim 3
Dependent Claim
21 words
The panel as defined in claim 1 wherein said perforated material has a perforation ratio of from about 0.03 to 0.05.
Claim 4
Dependent Claim
17 words
The panel as defined in claim 2 wherein said perforated material has a perforation ratio of 0.04.
Claim 5
Dependent Claim
25 words
The panel as defined in claim 3 wherein said low density material has a density of from about 1/2 to 3 pounds per cubic foot.
Claim 6
Dependent Claim
29 words
The panel as defined in claim 4 wherein said perforated material is made of a material having a density of from about 6 to 14 pounds per cubic foot.
Claim 7
Dependent Claim
46 words
The panel as defined in claim 5, including: a layer of fibrous, acoustically transparent mat attached to an exterior side of said medium density layer for improved panel rigidity and tackability, and having perforations therein which are aligned with the perforations in said medium density layer.
Claim 8
Dependent Claim
23 words
The panel as defined in claim 6 and further including an acoustically transparent fabric positioned to cover an exterior side of said mat.
Claim 9
Dependent Claim
18 words
The panel as defined in claim 7, wherein: said mat is integrally bonded to said medium density layer.
Claim 10
Dependent Claim
17 words
The panel as defined in claim 8, wherein: said medium density layer is about 1/4 inch thick.
Claim 11
Dependent Claim
15 words
The panel as defined in claim 9, wherein: said mat is about 0.030 inches thick.
Claim 12
Dependent Claim
17 words
The panel as defined in claim 10, wherein: said low density layer is about 7/8 inches thick.
Claim 13
Dependent Claim
25 words
The panel as defined in claim 1, wherein said low density material has a density of from about 1/2 to 3 pounds per cubic foot.
Claim 14
Dependent Claim
29 words
The panel as defined in claim 1, wherein said perforated material is made of a material having a density of from about 6 to 14 pounds per cubic foot.
Claim 15
Dependent Claim
46 words
The panel as defined in claim 1, including: a layer of fibrous, acoustically transparent mat attached to an exterior side of said medium density layer for improved panel rigidity and tackability, and having perforations therein which are aligned with the perforations in said medium density layer.
Claim 16
Dependent Claim
23 words
The panel as defined in claim 14, and further including an acoustically transparent fabric positioned to cover an exterior side of said mat.
Claim 17
Dependent Claim
17 words
The panel as defined in claim 1, wherein: said medium density layer is about 1/4 inch thick.
Claim 18
Dependent Claim
17 words
The panel as defined in claim 1, wherein: said low density layer is about 7/8 inches thick.
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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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |