Patent US5754491A successfully refreshed from Google Patents.
US5754491A
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Multi-technology acoustic energy barrier and absorber
Assignee: N-K MANUFACTURING TECHNOLOGIES Inc
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Filing: 1997-02-24
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Granted: 1998-05-19
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Expires: 2017-02-24
Abstract
Abstract A multi-technology acoustic energy barrier and absorber is disclosed that employs the teaching of U.S. Pat. No. 5,400,296 for a matrix material with at least two species of particles with differing characteristic acoustic impedances, in combination with the teaching of U.S. patent Pending Ser. No., 08/780,271, for an "Acoustic Absorption or Damping Material with Integral Viscous Damping," and with the principles underlying constrained-layer dampers.
Inventors
- 👤 William B. Cushman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:03
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/165
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
83 words
An acoustic attenuation or vibration damping material comprised of at least two layers of matrix material with a plurality of tortuous passageways penetrating throughout said matrix material, and with at least two species of particles incorporated within said matrix material, said particles being species differentiated by their characteristic acoustic impedances; and with at least one barrier layer of material disposed between said acoustic attenuation or vibration damping material layers; whereby a bi-directional barrier structure is formed with at least two external absorptive layers.
Claim 2
Dependent Claim
83 words
An acoustic attenuation or vibration damping material comprised of at least two layers of matrix material with a plurality of tortuous passageways penetrating throughout said matrix material, and with at least two species of particles incorporated within said matrix material, said particles being species differentiated by their characteristic acoustic impedances; and with at least one barrier layer of material disposed between said acoustic attenuation or vibration damping material layers; whereby a bi-directional barrier structure is formed with at least two external absorptive layers.
Claim 3
Dependent Claim
18 words
The acoustic absorption or vibration damping material of claim 1 where said matrix material is a thermoplastic material.
Claim 4
Dependent Claim
18 words
The acoustic absorption or vibration damping material of claim 1 where said matrix material is a thermoset material.
Claim 5
Dependent Claim
24 words
The acoustic absorption or vibration damping material of claim 1 where one of said species of particles incorporated within said matrix material is iron.
Claim 6
Dependent Claim
25 words
The acoustic absorption or vibration damping material of claim 1 where one of said species of particles incorporated within said matrix material is ceramic microspheres.
Claim 7
Dependent Claim
39 words
The acoustic absorption or vibration damping material of claim 1 where said barrier layer is comprised of a matrix material with at least two species of particles incorporated therein, said particles being species differentiated by their characteristic acoustic impedances.
Claim 8
Dependent Claim
88 words
An acoustic attenuation or vibration damping material comprised of a matrix material with a plurality of tortuous passageways penetrating throughout said matrix material, and with at least two species of particles incorporated within said matrix material, said particles being species differentiated by their characteristic acoustic impedances; and with at least two constraining layers of material with a higher tensile strength than said acoustic attenuation or vibration damping material attached on either side of said acoustic attenuation or vibration damping material, whereby a constrained-layer damping barrier structure is formed.
Claim 9
Dependent Claim
88 words
An acoustic attenuation or vibration damping material comprised of a matrix material with a plurality of tortuous passageways penetrating throughout said matrix material, and with at least two species of particles incorporated within said matrix material, said particles being species differentiated by their characteristic acoustic impedances; and with at least two constraining layers of material with a higher tensile strength than said acoustic attenuation or vibration damping material attached on either side of said acoustic attenuation or vibration damping material, whereby a constrained-layer damping barrier structure is formed.
Claim 10
Dependent Claim
18 words
The acoustic absorption or vibration damping material of claim 7 where said matrix material is a thermoplastic material.
Claim 11
Dependent Claim
18 words
The acoustic absorption or vibration damping material of claim 7 where said matrix material is a thermoset material.
Claim 12
Dependent Claim
24 words
The acoustic absorption or vibration damping material of claim 7 where one of said species of particles incorporated within said matrix material is iron.
Claim 13
Dependent Claim
25 words
The acoustic absorption or vibration damping material of claim 7 where one of said species of particles incorporated within said matrix material is ceramic microspheres.
Claim 14
Dependent Claim
38 words
The acoustic absorption or vibration damping material of claim 7 where said constraining layers are comprised of matrix material with at least two species of particles incorporated therein, said particles being species differentiated by their characteristic acoustic impedances.
Claim 15
Dependent Claim
151 words
An acoustic attenuation or vibration damping material comprised of a matrix material with a plurality of tortuous passageways penetrating throughout said matrix material, and with at least two species of particles incorporated within said matrix material, said particles being species differentiated by their characteristic acoustic impedances; and with at least two constraining layers of material with a higher tensile strength than said acoustic attenuation or vibration damping material attached on either side of said acoustic attenuation or vibration damping material; and with at least one additional outer layer comprised of an acoustic attenuation or vibration damping material comprised of a matrix material with a plurality of tortuous passageways penetrating throughout said matrix material, and with at least two species of particles incorporated within said matrix material, said particles being species differentiated by their characteristic acoustic impedances; whereby a constrained-layer damping barrier structure is formed with at least one external absorptive layer.
Claim 16
Dependent Claim
151 words
An acoustic attenuation or vibration damping material comprised of a matrix material with a plurality of tortuous passageways penetrating throughout said matrix material, and with at least two species of particles incorporated within said matrix material, said particles being species differentiated by their characteristic acoustic impedances; and with at least two constraining layers of material with a higher tensile strength than said acoustic attenuation or vibration damping material attached on either side of said acoustic attenuation or vibration damping material; and with at least one additional outer layer comprised of an acoustic attenuation or vibration damping material comprised of a matrix material with a plurality of tortuous passageways penetrating throughout said matrix material, and with at least two species of particles incorporated within said matrix material, said particles being species differentiated by their characteristic acoustic impedances; whereby a constrained-layer damping barrier structure is formed with at least one external absorptive layer.
Claim 17
Dependent Claim
18 words
The acoustic absorption or vibration damping material of claim 13 where said matrix material is a thermoplastic material.
Claim 18
Dependent Claim
18 words
The acoustic absorption or vibration damping material of claim 13 where said matrix material is a thermoset material.
Claim 19
Dependent Claim
24 words
The acoustic absorption or vibration damping material of claim 13 where one of said species of particles incorporated within said matrix material is iron.
Claim 20
Dependent Claim
25 words
The acoustic absorption or vibration damping material of claim 13 where one of said species of particles incorporated within said matrix material is ceramic microspheres.
Claim 21
Dependent Claim
38 words
The acoustic absorption or vibration damping material of claim 13 where said constraining layers are comprised of matrix material with at least two species of particles incorporated therein, said particles being species differentiated by their characteristic acoustic impedances.
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) | 2001-05-18 | 2001-11-17 | 2002-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-18 | 2005-11-17 | 2006-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-18 | 2009-11-17 | 2010-05-19 | $7700.00 | Window Closed / Lapsed |