Patent US3930561A successfully refreshed from Google Patents.
US3930561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low distortion pyramidal dispersion speaker
Assignee: MONITRON INDUSTRIES Inc
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Filing: 1974-06-07
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Granted: 1976-01-06
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Expires: 1994-06-07
Abstract
Abstract A loudspeaker horn has a conical section adapted to receive the driver assembly of a speaker system at the small cone end. An exponential section secured to the large cone end, concentrically with the cone longitudinal axis, flares outwardly to terminate in a square cross-section horn mouth. A raised lip secured around the periphery of the horn mouth diffracts sound symmetrically through a dispersion angle of about 120° with a drop of about six decibels or less.
Inventors
- 👤 Arnold I. Klayman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:56
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
A loudspeaker horn adapted to be driven by a speaker driver assembly, said horn comprising: a conical section having a small cone end compatible with said speaker driver assembly, said conical section flaring outwardly to provide substantially distortion-free coupling of the driver to the horn; an exponential section secured to the large cone end, said exponential section flaring exponentially outward to form a horn mouth, said horn mouth having a square cross-section; a raised diffraction lip secured around the periphery of said horn mouth; and means preventing any substantial vibration of the horn at the expected frequencies.
Claim 2
Dependent Claim
97 words
A loudspeaker horn adapted to be driven by a speaker driver assembly, said horn comprising: a conical section having a small cone end compatible with said speaker driver assembly, said conical section flaring outwardly to provide substantially distortion-free coupling of the driver to the horn; an exponential section secured to the large cone end, said exponential section flaring exponentially outward to form a horn mouth, said horn mouth having a square cross-section; a raised diffraction lip secured around the periphery of said horn mouth; and means preventing any substantial vibration of the horn at the expected frequencies.
Claim 3
Dependent Claim
21 words
A loudspeaker horn as defined in claim 1 wherein said exponential section is symmetrical about the longitudinal axis of said cone.
Claim 4
Dependent Claim
25 words
A loudspeaker horn as defined in claim 2 wherein the inner wall of said diffraction lip is parallel to the longitudinal axis of said horn.
Claim 5
Dependent Claim
51 words
A horn as defined in claim 3 wherein said lip has a height sufficient to create a drop of about six decibels or less as the horn is rotated in a polar dispersion test through at least 60° in any direction from alignment of its central longitudinal axis with a microphone.
Claim 6
Dependent Claim
15 words
A horn as defined in claim 4 wherein said conical section is a circular cone.
Claim 7
Dependent Claim
57 words
A horn as defined in claim 5 wherein: the inner wall of said diffraction lip is about 0.1 inches high and forms an angle of about 90° with the lip outer surface; and, said vibration preventing means includes walls of said conical and exponential sections sufficiently thick to provide an aperiodic horn in the expected frequency range.
References Cited (Backward Citations)
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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) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |