Patent US3930560A successfully refreshed from Google Patents.
US3930560A
Expired / Lapsed
US
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Damping element
Assignee: Knowles Electronics LLC
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Filing: 1974-07-15
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Granted: 1976-01-06
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Expires: 1994-07-15
Abstract
Abstract A damping element comprising fiberous fuseable material shaped to form a cup-like member which may be inserted in the sound openings of an acoustic transducer to provide a selected acoustic resistance.
Inventors
- 👤 Elmer V. Carlson
- 👤 August F. Mostardo, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:50
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/48; G; G10; G10K; G10K11/00; G10K11/02; H04R1/00; H04R1/20; H04R1/22; H04R1/225
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
An acoustic cup-like plug for positioning in an acoustical port; said plug being of a resilient material of fiber mesh or screen, the sides of the cup-like plug being fused to obtain a cylindrical wall, said wall being substantially acoustically impervious for cooperating with the sides of the associated port to form an acoustical seal therebetween, the screen end of said cup-like plug positioned substantially parallel to the plane of the port opening for providing a maximum area for the passage of sound while effecting a selected acoustical resistance, the fibers in the end of the plug being fused in discrete sections for selectively determining the acoustical resistance provided by the screen end of said cup to sound passing therethrough, and the plug being readily restorable to its initial shape if distorted whereby the member may be conveniently handled, shipped and cleaned.
Claim 2
Dependent Claim
142 words
An acoustic cup-like plug for positioning in an acoustical port; said plug being of a resilient material of fiber mesh or screen, the sides of the cup-like plug being fused to obtain a cylindrical wall, said wall being substantially acoustically impervious for cooperating with the sides of the associated port to form an acoustical seal therebetween, the screen end of said cup-like plug positioned substantially parallel to the plane of the port opening for providing a maximum area for the passage of sound while effecting a selected acoustical resistance, the fibers in the end of the plug being fused in discrete sections for selectively determining the acoustical resistance provided by the screen end of said cup to sound passing therethrough, and the plug being readily restorable to its initial shape if distorted whereby the member may be conveniently handled, shipped and cleaned.
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) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |