US4215764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic filter
Assignee: Fiber Materials Inc
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Filing: 1976-07-01
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Granted: 1980-08-05
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Expires: 1996-07-01
Abstract
Abstract An acoustical insulating material comprises a fiber reinforced lead composite sheet or panel. In a preferred embodiment of the invention the fibers are substantially axially parallel aligned with one another. The frequency absorption and transmission characteristics of the material may be varied by mechanically stressing the material, e.g. as by placing the material under tension in the direction of fiber orientation.
Inventors
- 👤 Roy D. Marangoni
- 👤 Horst Gigerenzer
- 👤 Roger T. Pepper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:06
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/165; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
47 words
A tunable sound insulating panel assembly comprising in combination: a fiber reinforced lead composite sheet having acoustical frequency transmission and absorption characteristics and means for applying a predetermined tensile stress along said sheet so as to modify said acoustical frequency absorption and transmission characteristics of said sheet.
Claim 2
Dependent Claim
47 words
A tunable sound insulating panel assembly comprising in combination: a fiber reinforced lead composite sheet having acoustical frequency transmission and absorption characteristics and means for applying a predetermined tensile stress along said sheet so as to modify said acoustical frequency absorption and transmission characteristics of said sheet.
Claim 3
Dependent Claim
29 words
A sound insulating panel as defined in claim 1 wherein said means for applying said predetermined tensile stress comprises a substantially rigid frame for holding said sheet in tension.
Claim 4
Dependent Claim
38 words
A sound insulating panel as defined in claim 2 wherein said sheet comprises fibers substantially axially parallel aligned with one another, and said rigid frame is for holding said sheet under tension in the direction of fiber orientation.
Claim 5
Dependent Claim
25 words
A sound insulating panel as defined in claim 3 wherein said fibers are selected from the group consisting of carbon, graphite, glass, copper and steel.
Claim 6
Dependent Claim
15 words
A sound insulating panel as defined in claim 3 wherein said fibers comprise carbon fibers.
Claim 7
Dependent Claim
15 words
A sound insulating panel as defined in claim 3 wherein said fibers comprise glass fibers.
Claim 8
Dependent Claim
15 words
A sound insulating panel as defined by claim 3 wherein said fibers comprise steel fibers.
Claim 9
Dependent Claim
34 words
A sound insulating panel as defined by claim 5, wherein said carbon fibers have a coating selected from the group consisting of titanium boride, titanium carbide and mixtures of titanium boride and titanium carbide.
Claim 10
Independent Claim
41 words
A method of forming a tunable sound insulating panel, comprising the steps of: forming a fiber reinforced lead composite sheet, and applying a tensile stress along said sheet so as to adjust the acoustical absorption and transmission characteristics of said sheet.
Claim 11
Independent Claim
41 words
A method of forming a tunable sound insulating panel, comprising the steps of: forming a fiber reinforced lead composite sheet, and applying a tensile stress along said sheet so as to adjust the acoustical absorption and transmission characteristics of said sheet.
Claim 12
Dependent Claim
30 words
A method as defined in claim 9 including the step of substantially axially parallel aligning said fibers in said sheet, and applying said stress in the direction of fiber orientation.
Claim 13
Independent Claim
61 words
A method of enhancing the mechanical strength of lead and also forming a sound insulating panel comprising the said lead, said method comprising the steps in sequence of: (1) forming a fiber reinforced composite sheet with the said lead, and (2) applying a tensile stress along said sheet so as to adjust the acoustical absorpotion and transmission characteristics of said sheet.
Claim 14
Independent Claim
61 words
A method of enhancing the mechanical strength of lead and also forming a sound insulating panel comprising the said lead, said method comprising the steps in sequence of: (1) forming a fiber reinforced composite sheet with the said lead, and (2) applying a tensile stress along said sheet so as to adjust the acoustical absorpotion and transmission characteristics of said sheet.
Claim 15
Dependent Claim
30 words
A method as defined in claim 11 including the step of substantially axially parallel aligning said fibers in said composite, and applying said stress in the direction of fiber orientation.
References Cited (Backward Citations)
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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) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |