Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 7299893 | Loudspeaker horn and method for controlling grating lobes in a line array of acoustic sources A loudspeaker horn (11) having a throat end (13) for receiving acoustic power from aligned acoustic power sources (41, 43, 45), an elongated throat (33), and a flared section (17) is provided with grating lobe mitigation fins (2... | 11/27/2007 |
| 7219873 | Support base for a structural pole A support base for supporting a structural pole is provided. The support base includes a frame having an internal cavity for housing hardware, such as a speaker assembly, that is associated with the corresponding structural pole. The frame is generally open laterall... | 05/22/2007 |
| 7044265 | Constant directivity acoustic horn An improved throat (2) for transmitting acoustic energy from a source driver unit (7) to a feeder section (3) of a directivity controlling acoustic horn is disclosed. The throat (2) comprises: a circular throat entrance (2i)... | 05/16/2006 |
| 6905001 | Sounders for fire alarm systems A sounder is disclosed which has walling (36, 38) defining a first air column (26) leading to a first sound aperture (34) through which the first column opens to atmosphere, and walling (40, 44) defining a second air column (60) le... | 06/14/2005 |
| 6393131 | Loudspeaker A loudspeaker includes a cabinet designed so as to define a central compartment sandwiched between upper and lower compartments. The cabinet is symmetrical about a vertical central, fore-and-aft extending plane. Located in each of the upper and lower comp... | 05/21/2002 |
| 5804774 | Ported reflex horn An integrally formed ported reflex horn comprises an outer housing having a plurality of side walls disposed about a central axis, an open discharge end and a second closed end, oppositely disposed to the open end. The horn also includes a compression dri... | 09/08/1998 |
| 5675133 | Horn and sounder The horn and sounder includes an upper body, a lower body, and a mouth piece. The upper and lower bodies are provided at their rear outer periphery with annular ribs to engage with grooves formed inside the mouth piece, so that the mouth piece can bind th... | 10/07/1997 |
| 5397866 | Dual acoustic horn assembly An acoustic horn assembly for use as part of an electronic siren system for an emergency vehicle comprises a pair of integrated molded, rigid plastic members which cooperate to define a pair of divergent sound passages. The entrance ends of these sound pa... | 03/14/1995 |
| 5220608 | Method and means for stereophonic sound reproduction Monophonic sound is transformed into a stereo pattern by arranging two reflectors on a common axis at a predetermined distance from each other with both facing in the direction of the sound. One reflector has a larger diameter than the other and is provid... | 06/15/1993 |
| 5160815 | Megaphone apparatus A megaphone apparatus includes an elongate conical conduit directed into an outwardly flaring forward body portion. The conduit includes an entrance opening, with the flaring body including a plurality of exit openings defined by a central outlet conduit ... | 11/03/1992 |
| 5004067 | Cinema sound system for unperforated screens A cinema sound system for unperforated screens includes for each stereophonic channel a floor positioned direct radiator bass speaker unit radiating into quarter space and an upper frequency speaker unit mounted above the screen. Each upper frequency spea... | 04/02/1991 |
| 4997058 | Sound transducer An improved flat sound transducer including a planar diaphragm having at least one region suited for reproduction of low frequencies and one region suited for reproduction of high frequencies wherein the frame of the flat sound transducer is used to sandw... | 03/05/1991 |
| 4969196 | Speaker and horn array A speaker and horn array having improved audio characteristics is formed in a baffle case. A plurality of small speakers are mounted in the baffle case in a vertical array in close proximity with one another. Each of the speakers has an acoustic baffle ov... | 11/06/1990 |
| 4908601 | Loud speaker with horizontal radiation pattern A siren having one or more stacked speakers, each speaker having a substantially circular lower horn member having an upwardly facing surface including a substantially convex annular portion and a substantially concave central cavity portion. A substantia... | 03/13/1990 |
| 4893343 | Dual diverging manifold loudspeaker system A dual diverging manifold loudspeaker system includes a generally cubically-shaped outer horn housing and an inner dome-like cap member for encapsulating therebetween a compression driver assembly. The loudspeaker system includes a back plate member which... | 01/09/1990 |
| 4878561 | Sound emitter An omnidirectional sound emitter with separate sound sources (1, 2), each comprising a funnel-shaped horn (4), is characterized in that the sound sources (1, 2) are mutually arranged such that the acoustic main axes (6) of the horns (4) lie in essentially... | 11/07/1989 |
| 4847590 | Outdoor warning siren An improved outdoor warning siren comprising an electromechanical siren together with a multi-segment horn which effects an exceptionally smooth transition from a small high pressure area at the horn inlet to a larger low pressure area at the horn outlet ... | 07/11/1989 |
| 4776428 | Sound projection system A sound projection system for use in diffusing sound of a frequency ranging from 160 Hz up to 5 KHz over a relatively long distance with a substantially constant distribution of the sound over a wide diffusion angle, whereby the quality and intensity of t... | 10/11/1988 |
| 4390078 | Loudspeaker horn A loudspeaker horn which provides constant coverage angles in both the horizontal and vertical planes and affords proper driver loading and a smooth impedance curve down to the lowest frequencies of operation. The throat entrance of the horn is round, to ... | 06/28/1983 |
| 4299304 | Exponential folded horn speaker enclosure An exponential folded horn loudspeaker enclosure is built so that all of its components are coaxial with respect to a line that is equidistant from three cooperating surfaces, including floor or ceiling, as well as the customary two walls of a corner. Per... | 11/10/1981 |
| 4174019 | Dual speaker A dual loudspeaker is set up to handle separately high frequency and low frequency sounds in the same piece of equipment. The apparatus comprises a single housing having a vertical partition dividing the housing into two chambers. A high-frequency driver ... | 11/13/1979 |
| 4091891 | Horn speaker A horn speaker comprising a diaphragm positioned close to a throat and side walls forming sound passages for radiating the vibrations of the diaphragm effectively as sound waves from the mouth of the speaker.... | 05/30/1978 |
