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US3851724A
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Acoustic damping structures
Assignee: Bomco Inc
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Filing: 1974-02-25
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Granted: 1974-12-03
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Expires: 1994-02-25
Abstract
Abstract An acoustic damping structure is provided consisting essentially of a flexible lead sheet bearing a plurality of concavities in one major surface thereof. Acoustic damping of a noise producing surface is accomplished by fixation of the damping structure thereto.
Inventors
- 👤 N Banks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:57
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/8409; E04B2001/8414; E04B2001/8457; E04B2001/8461; E04B2001/8476; E04B2001/848; E04B2001/8485
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
106 words
An acoustic damping structure consisting essentially of a lead sheet having A. a lead content of at least 50 weight percent, B. a thickness of between 0.007 and 0.100 inch, and C. two major opposed surfaces; one of said major surfaces having a plurality of concavities therein, each concavity having an area of at least 0.01 inch2, the sum of the areas of said concavities being at least 30 percent of the area of the one major surface containing them and the number of concavities being sufficient to provide a population density thereof of at least 50 concavities per square foot of said one major surface.
Claim 2
Dependent Claim
106 words
An acoustic damping structure consisting essentially of a lead sheet having A. a lead content of at least 50 weight percent, B. a thickness of between 0.007 and 0.100 inch, and C. two major opposed surfaces; one of said major surfaces having a plurality of concavities therein, each concavity having an area of at least 0.01 inch2, the sum of the areas of said concavities being at least 30 percent of the area of the one major surface containing them and the number of concavities being sufficient to provide a population density thereof of at least 50 concavities per square foot of said one major surface.
Claim 3
Dependent Claim
31 words
The acoustic damping structure of claim 1 wherein the sum of the areas of said concavities is at least 40 percent of the area of the one major surface containing them.
Claim 4
Dependent Claim
27 words
The acoustic damping structure of claim 1 wherein the population density of said concavities is at least 200 concavities per square foot of said one major surface.
Claim 5
Dependent Claim
49 words
The acoustic damping structure of claim 1 wherein concavities of at least two substantially different areas are employed, wherein the ratio of the larger area to the smaller area is between 5:1 and 10:1 and wherein the larger area concavities are in alternate array with the smaller area concavities.
Claim 6
Dependent Claim
25 words
The acoustic damping structure of claim 1 wherein at least 50 percent of the concavties are each provided with a substantially centrally located aperture therethrough.
Claim 7
Dependent Claim
25 words
The acoustic damping structure of claim 1 wherein at least 90 percent of the concavities are each provided with a substantially centrally located aperture therethrough.
Claim 8
Dependent Claim
40 words
The acoustic damping structure of claim 1 wherein said concavities in the one major surface of the lead sheet are formed by indentation thereof to a depth sufficient to form corresponding protuberances on the other major surface of said sheet.
Claim 9
Dependent Claim
18 words
The acoustic damping structure of claim 1 wherein the planar shape of each said concavity is essentially circular.
Claim 10
Dependent Claim
20 words
The acoustic damping structure of claim 1 wherein the interstices of the concavity-bearing major surface are coated with an adhesive.
Claim 11
Dependent Claim
15 words
The acoustic damping structure of claim 9 wherein said adhesive is a pressure sensitive adhesive.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |