US4010821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Omnidirectional sympathetically driven sound reproduction device
Assignee: Individual
•
Filing: 1975-05-02
•
Granted: 1977-03-08
•
Expires: 1995-05-02
Abstract
Abstract A sound reproduction device formed of an enclosure of expanded or foamed polymeric material, preferably polystyrene, which houses a centrally suspended speaker system, preferably a wafer multi-range speaker system. The enclosure is substantially closed and is acoustically excited by the speaker system to propagate sound thus requiring only a small ventilation opening to permit movement of the enclosure walls.
Inventors
- 👤 Leo-Heinz Quillmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:55
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/02; H04R1/021; H04R1/20; H04R1/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
64 words
A sound reproduction device comprising substantially closed enclosure formed of pliable walls of expanded polymeric material having vent holes defined therein and a speaker system means suspended within and fully surrounded by the enclosure with the enclosure shielding the speaker system means from the atmosphere, thereby acoustically driving the pliable enclosure walls which in turn radiate sound in an omnidirectional manner to the atmosphere.
Claim 2
Dependent Claim
64 words
A sound reproduction device comprising substantially closed enclosure formed of pliable walls of expanded polymeric material having vent holes defined therein and a speaker system means suspended within and fully surrounded by the enclosure with the enclosure shielding the speaker system means from the atmosphere, thereby acoustically driving the pliable enclosure walls which in turn radiate sound in an omnidirectional manner to the atmosphere.
Claim 3
Dependent Claim
19 words
A sound reproduction device as set forth in claim 1 in which the enclosure is formed of foamed polystyrene.
Claim 4
Dependent Claim
41 words
A sound reproduction system as set forth in claim 1 in which the speaker system is a wafer system and is suspended in the enclosure by a sheet of expanded polymeric material surrounding the speakers and attached to the enclosure walls.
Claim 5
Dependent Claim
21 words
A sound reproduction device as set forth in claim 3 in which the speaker system comprises at least three concentric diaphragms.
Claim 6
Dependent Claim
53 words
A sound reproduction device as set forth in claim 1 in which supports are provided on one portion of the enclosure and the vent holes are positioned in the same portion of the enclosure, whereby the sound emitting from the holes will be directed downward when the enclosure is resting on the supports.
Claim 7
Dependent Claim
30 words
A sound reproduction device as set forth in claim 1 in which the enclosure is formed of two joined unitary sections and is in the shape of a hollow box.
Claim 8
Dependent Claim
20 words
A sound reproduction device as set forth in claim 1 in which the enclosure wall thickness is about 1 centimeter.
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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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |