Patent US3858679A successfully refreshed from Google Patents.
US3858679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker system which produces stereo-like sounds
Assignee: Individual
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Filing: 1973-11-15
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Granted: 1975-01-07
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Expires: 1993-11-15
Abstract
Abstract An improved loud speaker system which when connected to a monophonic electronic source will produce a stero-like sound. The system consists of a speaker cabinet which is divided into two separate chambers by means of a central partition. Each chamber contains a loudspeaker behind openings in the front wall. The front wall is covered on its outer side by acoustical grill cloth. The loudspeakers are electrically connected in a parallel circuit. One of the chambers is sealed on all sides while the other chamber has a series of openings through its rear wall.
Inventors
- 👤 Jack Askins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:23
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/227
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
In a loudspeaker system which produces stereo-like sound when connected to a monophonic electronic source, the combination of a cabinet having an interior divided by a partition into two laterally disposed adjacent chambers directly radiating, loudspeakers in each said chamber, one of said chambers being a sealed chamber and the other being vented.
Claim 2
Dependent Claim
53 words
In a loudspeaker system which produces stereo-like sound when connected to a monophonic electronic source, the combination of a cabinet having an interior divided by a partition into two laterally disposed adjacent chambers directly radiating, loudspeakers in each said chamber, one of said chambers being a sealed chamber and the other being vented.
Claim 3
Dependent Claim
70 words
The combination as set forth in claim 1, wherein both said two adjacent laterally disposed separate chambers have said loudspeakers mounted on a rear side of a front wall thereof, each front wall having an opening through in front of each said loudspeaker, the remainder of said sealed chamber being closed, while the said vented chamber has a series of perforated openings through one or more of different walls thereof.
Claim 4
Dependent Claim
27 words
The combination as set forth in claim 2, wherein braces and fibreglass wool are employed on any walls of said sealed chamber, so as to minimize reverberation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |