US4109983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker cabinet
Assignee: Pioneer Corp
•
Filing: 1977-03-07
•
Granted: 1978-08-29
•
Expires: 1997-03-07
Abstract
Abstract A speaker cabinet is constituted with plate material formed by intimately bonding a rigid foam plate having communicating or open-cell bubbles to a surface plate material with the latter being outside.
Inventors
- 👤 Shouzo Kinoshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:13
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; B32B21/00; B32B21/04; B32B21/047; B32B3/00; B32B3/26; B32B3/28; B32B2266/00; B32B2266/04; B32B2266/045; B32B2266/06; B32B2307/00; B32B2307/10; B32B2307/102; B32B2307/70; B32B2307/724; B32B2307/7242; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/24996; Y10T428/249967; Y10T428/249968
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
An acoustically improved speaker cabinet for housing a speaker and having a plurality of walls each having an inner surface and an outer surface, and wherein each wall comprises a rigid, sound-absorbing open-cell foamed place containing communicating bubbles and forming said inner surface, and a surface plate intimately bonded to said foamed plate and forming the outer surface of the wall, said surface plate being relatively impermeable to air, whereby the effective acoustical interior volume of said cabinet is substantially larger than the actual physical volume thereof, and whereby resonant vibration of the cabinet is eliminated.
Claim 2
Dependent Claim
96 words
An acoustically improved speaker cabinet for housing a speaker and having a plurality of walls each having an inner surface and an outer surface, and wherein each wall comprises a rigid, sound-absorbing open-cell foamed place containing communicating bubbles and forming said inner surface, and a surface plate intimately bonded to said foamed plate and forming the outer surface of the wall, said surface plate being relatively impermeable to air, whereby the effective acoustical interior volume of said cabinet is substantially larger than the actual physical volume thereof, and whereby resonant vibration of the cabinet is eliminated.
Claim 3
Dependent Claim
15 words
A speaker cabinet according to claim 1, wherein said foamed plate is of foamed concrete.
Claim 4
Dependent Claim
20 words
A speaker cabinet according to claim 2, wherein said foamed concrete has specific weight in a range 0.3 to 0.6.
Claim 5
Dependent Claim
15 words
A speaker cabinet according to claim 1, wherein said foamed plate is of foamed aluminum.
References Cited (Backward Citations)
US3357585A
Cited
US3443007A
Cited
US3753843A
Cited
US3763858A
Cited
US3708385A
Cited
US3735041A
Cited
US3989781A
Cited
US3944704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |