Patent US3504610A successfully refreshed from Google Patents.
US3635307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grill cloth for loudspeaker
Assignee: Individual
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Filing: 1970-01-06
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Granted: 1972-01-18
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Expires: 1990-01-06
Abstract
Abstract An enclosure for a loudspeaker provided with a frame spaced therefrom and supporting a cloth which is porous and is provided with a plurality of closely spaced elongated strips of metallic foil secured to the cloth at one end. When sound is emitted from the enclosure, the cloth moves and the strips flutter and glitter.
Inventors
- 👤 Frank L Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:15
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/02; H04R1/023
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
In combination with a loudspeaker enclosure having a front port disposed in a front panel; a porous speaker grill covering said port and spaced a predetermined distance from the diaphragm of said loudspeaker providing an air space therebetween, frame means for holding said speaker grill in place over said port, and a plurality of closely packed elongated flexible elements secured at one end only to said grill, said elements being caused to flutter and move up and down freely responsive to sound waves from said loudspeaker passing through said port.
Claim 2
Dependent Claim
90 words
In combination with a loudspeaker enclosure having a front port disposed in a front panel; a porous speaker grill covering said port and spaced a predetermined distance from the diaphragm of said loudspeaker providing an air space therebetween, frame means for holding said speaker grill in place over said port, and a plurality of closely packed elongated flexible elements secured at one end only to said grill, said elements being caused to flutter and move up and down freely responsive to sound waves from said loudspeaker passing through said port.
Claim 3
Dependent Claim
32 words
The combination according to claim 1 wherein said speaker grill is composed of a porous flexible cloth, said frame means serving to hold said cloth in a tAut condition over said port.
Claim 4
Dependent Claim
15 words
The combination according to claim 2 wherein said elongated elements comprise strips of metallic foil.
Claim 5
Dependent Claim
35 words
The combination according to claim 2 wherein said cloth is located on the outside face of said front panel, the depth of said air space being at least equal to the thickness of said panel.
Claim 6
Dependent Claim
20 words
The combination according to claim 2 wherein said cloth grill is movable responsive to the sound waves from said loudspeaker.
References Cited (Backward Citations)
US3066381A
Cited
US3291251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |