Patent US5526324A successfully refreshed from Google Patents.
US5526324A
Expired / Lapsed
US
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Acoustic absorption and damping material with piezoelectric energy dissipation
Assignee: Poiesis Res Inc
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Filing: 1995-08-16
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Granted: 1996-06-11
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Expires: 2015-08-16
Abstract
Abstract Acoustic absorption and vibration damping materials are produced by mixing electrically conductive particles or strands into a piezoelectric matrix material. The electrically conductive particles or strands act as small localized electrical short-circuits within the matrix material and effectively dissipate the electric charges produced by piezoelectric effect from the pressure of acoustic or vibrational energy as heat. All energy thus converted into heat is subtracted from the original acoustic or vibrational energy, resulting in acoustic absorption and/or vibration damping.
Inventors
- 👤 William B. Cushman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:42
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/165
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
44 words
An acoustic absorption or vibration damping material comprised of a piezoelectrically active matrix material with a plurality of electrically conductive particles incorporated and embedded therein such that said electrically conductive particles are substantially encapsulated and enclosed within and by said piezoelectrically active matrix material.
Claim 2
Dependent Claim
44 words
An acoustic absorption or vibration damping material comprised of a piezoelectrically active matrix material with a plurality of electrically conductive particles incorporated and embedded therein such that said electrically conductive particles are substantially encapsulated and enclosed within and by said piezoelectrically active matrix material.
Claim 3
Dependent Claim
17 words
The acoustic absorption or vibration damping material of claim 1 where said matrix material is polyvinylidene fluoride.
Claim 4
Dependent Claim
19 words
The acoustic absorption or vibration damping material of claim 1 where said electrically conductive particles are made from graphite.
Claim 5
Dependent Claim
20 words
The acoustic absorption or vibration damping material of claim 1 where said electrically conductive particles are made from a metal.
Claim 6
Dependent Claim
44 words
An acoustic absorption or vibration damping material comprised of a piezoelectrically active matrix material with a plurality of electrically conductive strands incorporated and embedded therein such that said electrically conductive strands are substantially encapsulated and enclosed within and by said piezoelectrically active matrix material.
Claim 7
Dependent Claim
44 words
An acoustic absorption or vibration damping material comprised of a piezoelectrically active matrix material with a plurality of electrically conductive strands incorporated and embedded therein such that said electrically conductive strands are substantially encapsulated and enclosed within and by said piezoelectrically active matrix material.
Claim 8
Dependent Claim
17 words
The acoustic absorption or vibration damping material of claim 5 where said matrix material is polyvinylidene fluoride.
Claim 9
Dependent Claim
19 words
The acoustic absorption or vibration damping material of claim 5 where said electrically conductive strands are made from graphite.
Claim 10
Dependent Claim
20 words
The acoustic absorption or vibration damping material of claim 5 where said electrically conductive strands are made from a metal.
Claim 11
Dependent Claim
18 words
The acoustic absorption or vibration damping material of claim 5 where said electrically conductive strands are long fibers.
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) | 1999-06-11 | 1999-12-11 | 2000-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-11 | 2003-12-11 | 2004-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-11 | 2007-12-11 | 2008-06-11 | $7700.00 | Window Closed / Lapsed |