Patent US3667568A successfully refreshed from Google Patents.
US3667568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure compensator for speaker cabinets
Assignee: Electronics Inc
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Filing: 1970-09-15
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Granted: 1972-06-06
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Expires: 1990-09-15
Abstract
Abstract A pressure compensator for speaker cabinets is provided which includes a flexible rubber diaphragm attached to the rear of a speaker cabinet covering a plurality of vent holes and which includes an adjustable rod engaged in a plastic dome within a sponge rubber ball at the center of the diaphragm which extends the diaphragm so as to form a logarithmic profile to substantially reduce the back wave. A second diaphragm may also be employed spaced from the first mentioned diaphragm for greater suppression.
Inventors
- 👤 Arthur Liebscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:22
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/283; H04R1/2834; H04R1/2869; H04R1/2873
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
In a loudspeaker cabinet enclosure having a front wall with a speaker mounted thereon having a movable diaphragm separating front and back waves, said enclosure having a rear wall with at least one opening therethrough, and pressure compensator means for said enclosure mounted on said rear wall in sealing relation to said opening equalizing said front and back waves at system resonance, said pressure compensator means comprising an elastic diaphragm in closing relation to said opening, and a fixedly positioned member engaging the central portion of said diaphragm to hold said diaphragm in a shape free from resonance at bass and low midrange frequencies.
Claim 2
Dependent Claim
104 words
In a loudspeaker cabinet enclosure having a front wall with a speaker mounted thereon having a movable diaphragm separating front and back waves, said enclosure having a rear wall with at least one opening therethrough, and pressure compensator means for said enclosure mounted on said rear wall in sealing relation to said opening equalizing said front and back waves at system resonance, said pressure compensator means comprising an elastic diaphragm in closing relation to said opening, and a fixedly positioned member engaging the central portion of said diaphragm to hold said diaphragm in a shape free from resonance at bass and low midrange frequencies.
Claim 3
Dependent Claim
15 words
The combination defined in claim 1 in which said shape is exponential in cross section
Claim 4
Dependent Claim
18 words
The combination defined in claim 1 in which said member includes a rod mounted on said rear wall.
Claim 5
Dependent Claim
13 words
The combination defined in claim 3 in which said rod is manually adjustable.
Claim 6
Dependent Claim
20 words
The combination defined in claim 3 in which said rod is a threaded rod adjustably mounted on said rear wall.
Claim 7
Dependent Claim
18 words
The combination defined in claim 1 in which said member includes a ball in engagement with said diaphragm.
Claim 8
Dependent Claim
34 words
The combination defined in claim 6 in which a plastic dome is provided on which said resilient ball is carried and said dome is carried by a rod adjustably mounted in said rear wall.
Claim 9
Dependent Claim
41 words
The combination defined in claim 1 in which a second elastic diaphragm is provided centrally engaged in spaced relation to the first diaphragm and with its outer margins clamped in spaced relation to the outer margins of the first mentioned diaphragm.
References Cited (Backward Citations)
US2713396A
Cited
US3554313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |