US4524845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low frequency speaker enclosure
Assignee: Individual
•
Filing: 1983-02-28
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Granted: 1985-06-25
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Expires: 2003-02-28
Abstract
Abstract This invention relates to low-frequency speaker enclosures in general, and more specifically to a dual cabinet construction, wherein each of the cabinet structures contains a portion of a generally semi-circular uniform diameter horn passageway, formed by contoured foam elements that provide redirection and amplification of rear-cone sound wave energy, through the forward face of the combined cabinet construction.
Inventors
- 👤 Stephen M. Perrigo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:45
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2861; H04R1/2865
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
210 words
An improved low frequency speaker enclosure comprising: an upper cabinet structure divided by partitions into upper front and rear compartments wherein each of the upper compartments are provided with a contoured molded foam element; and the contoured molded foam element in the upper rear compartment foams a portion of a generally semi-circular, generally constant diameter, tube horn passageway; and the contoured molded foam element in the upper front compartment forms an opening, having one end that coincides with the generally constant diameter of said tube horn passageway, and whose other end is dimensioned to accommodate a low frequency speaker; and a lower cabinet structure connected to the upper cabinet structure, wherein the lower cabinet structure is also divided by partitions into lower front and rear compartments, wherein each of the lower compartments are provided with a contoured molded foam element; and the contoured molded foam element in the lower rear compartment forms the remaining portion of the said generally semi-circular, generally constant diameter, tube horn passageway; and, the contoured molded foam element in the lower front compartment forms a sharply tapered conical opening, whose one end coincides with the said generally constant diameter of the tube horn passageway, and whose other end forms the mouth of the tube horn passageway.
Claim 2
Dependent Claim
210 words
An improved low frequency speaker enclosure comprising: an upper cabinet structure divided by partitions into upper front and rear compartments wherein each of the upper compartments are provided with a contoured molded foam element; and the contoured molded foam element in the upper rear compartment foams a portion of a generally semi-circular, generally constant diameter, tube horn passageway; and the contoured molded foam element in the upper front compartment forms an opening, having one end that coincides with the generally constant diameter of said tube horn passageway, and whose other end is dimensioned to accommodate a low frequency speaker; and a lower cabinet structure connected to the upper cabinet structure, wherein the lower cabinet structure is also divided by partitions into lower front and rear compartments, wherein each of the lower compartments are provided with a contoured molded foam element; and the contoured molded foam element in the lower rear compartment forms the remaining portion of the said generally semi-circular, generally constant diameter, tube horn passageway; and, the contoured molded foam element in the lower front compartment forms a sharply tapered conical opening, whose one end coincides with the said generally constant diameter of the tube horn passageway, and whose other end forms the mouth of the tube horn passageway.
Claim 3
Dependent Claim
43 words
An improved low frequency speaker enclosure as in claim 1; wherein, the generally semi-circular tube horn passageway is disposed to receive rear cone sound waves of the low frequency speaker and redirect said waves through the front compartment of the lower cabinet structure.
Claim 4
Dependent Claim
22 words
An improved low frequency speaker enclosure as in claim 2; wherein, the contoured molded foam elements are fabricated from sound insulating foam.
Claim 5
Dependent Claim
18 words
An improved low frequency speaker enclosure as in claim 3, wherein the said sound insulating foam is polyurethane.
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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) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |