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US5400296A Expired / Lapsed US ⏱️ 0.0 years remaining

Acoustic attenuation and vibration damping materials

Assignee: POIESIS RESEARCH Inc
•
Filing: 1994-01-25
•
Granted: 1995-03-21
•
Expires: 2014-01-25
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Abstract

Abstract A means of enhancing the acoustic attenuation and vibration damping of a material by embedding high characteristic acoustic impedance particles, low characteristic acoustic impedance particles, or both high and low characteristic acoustic impedance particles within the matrix of the material is disclosed. The mass of the resultant material may be very low while retaining excellent acoustic attenuation, vibration damping, and structural characteristics. When particles with mismatched characteristic acoustic impedances are embedded within the matrix of a material that can support shearing loads, propagating acoustic energy that encounters the particles of the instant invention is partially reflected in random directions. That is, the propagating energy is diffused. As the propagation vectors and modes of acoustic energy are effectively randomized, the probability of localized energy absorption and damping is increased. We present acoustic attenuation and vibration damping data for some representative examples of the instant invention and other commercially available materials.

Inventors

  • 👤 William B. Cushman
  • 👤 Gerald B. Thomas

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 13:35
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/165

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 136 words
An acoustic attenuation and vibration damping material comprised of a matrix material with a plurality of at least two species of particles incorporated therein, said particles being species differentiated by their characteristic acoustic impedances, and said particle species being proportionally distributed in said matrix material so that an increase in acoustic attenuating and vibration damping effect of said matrix material with said combination of at least two species of particles incorporated therein, relative to the acoustic attenuating and vibration damping effect of said matrix material with no particles incorporated therein, is greater than the sum of increases in acoustic attenuating and vibration damping effects of each particle species incorporated individually at the same concentration in said matrix material, relative to the acoustic attenuating and vibration damping effect of said matrix material with no particles incorporated therein.
Claim 2
Dependent Claim 136 words
An acoustic attenuation and vibration damping material comprised of a matrix material with a plurality of at least two species of particles incorporated therein, said particles being species differentiated by their characteristic acoustic impedances, and said particle species being proportionally distributed in said matrix material so that an increase in acoustic attenuating and vibration damping effect of said matrix material with said combination of at least two species of particles incorporated therein, relative to the acoustic attenuating and vibration damping effect of said matrix material with no particles incorporated therein, is greater than the sum of increases in acoustic attenuating and vibration damping effects of each particle species incorporated individually at the same concentration in said matrix material, relative to the acoustic attenuating and vibration damping effect of said matrix material with no particles incorporated therein.
Claim 3
Dependent Claim 19 words
The acoustic attenuation and vibration damping material of claim 1 where said matrix material is a urethane type material.
Claim 4
Dependent Claim 20 words
The acoustic attenuation and vibration damping material of claim 1 where said matrix material is a silicone rubber type material.
Claim 5
Dependent Claim 17 words
The acoustic attenuation and vibration damping material of claim 1 where said matrix material is an elastomer.
Claim 6
Dependent Claim 17 words
The acoustic attenuation and vibration damping material of claim 1 where said matrix material is a polymer.
Claim 7
Dependent Claim 18 words
The acoustic attenuation and vibration damping material of claim 1 where said matrix material is a petroleum extract.
Claim 8
Dependent Claim 16 words
The acoustic attenuation and vibration damping material of claim 1 where said matrix material is gypsum.
Claim 9
Dependent Claim 18 words
The acoustic attenuation and vibration damping material of claim 1 where one of said particle species is lead.
Claim 10
Dependent Claim 18 words
The acoustic attenuation and vibration damping material of claim 1 where one of said particle species is steel.
Claim 11
Dependent Claim 20 words
The acoustic attenuation and vibration damping material of claim 1 where one of said particle species is glass micro spheres.
Claim 12
Dependent Claim 18 words
The acoustic attenuation and vibration damping material of claim 1 where one of said particle species is cork.

References Cited (Backward Citations)

US2198885A Cited
US3615961A Cited
US3894169A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1998-03-20 1998-09-19 1999-03-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2002-03-20 2002-09-19 2003-03-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2006-03-20 2006-09-19 2007-03-21 $7700.00 Window Closed / Lapsed

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