Patent US4837837A successfully refreshed from Google Patents.
US4837837A
Expired / Lapsed
US
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Loudspeaker
Assignee: Individual
•
Filing: 1987-11-05
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Granted: 1989-06-06
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Expires: 2007-11-05
Abstract
Abstract The efficiency of a loudspeaker housing is substantially increased by incorporating in the housing, in the form of a lining or stuffing, a quantity of goat's hair, preferably mohair.
Inventors
- 👤 Anthony R. Taddeo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:16
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2815; H04R1/2819; H04R1/2869; H04R1/2876; H04R1/288
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
In combination with a loudspeaker housing having therein a pair of openings, a loudspeaker mounted in and closing one of said openings, and a plurality of baffles mounted in said housing and forming therein a labyrinth communicating at one end with said loudspeaker and at its opposite end with the other of said openings in said housing, an improved high frequency sound damping material comprising a quantity of mohair fibers positioned in said housing and operatively filling a portion of said labyrinth to a level such that all sound waves emanating from said loudspeaker must pass through said mohair fibers before reaching said other opening, said mohair fibers having a scaliness less than that of wool fibers.
Claim 2
Dependent Claim
117 words
In combination with a loudspeaker housing having therein a pair of openings, a loudspeaker mounted in and closing one of said openings, and a plurality of baffles mounted in said housing and forming therein a labyrinth communicating at one end with said loudspeaker and at its opposite end with the other of said openings in said housing, an improved high frequency sound damping material comprising a quantity of mohair fibers positioned in said housing and operatively filling a portion of said labyrinth to a level such that all sound waves emanating from said loudspeaker must pass through said mohair fibers before reaching said other opening, said mohair fibers having a scaliness less than that of wool fibers.
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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) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |