Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 7051835 | Bass-reflex loudspeaker system and method of manufacturing the same The loudspeaker construction comprises a loudspeaker chamber delimited by a loudspeaker enclosure structure, a reflex duct communicating with the loudspeaker chamber so as to connect the loudspeaker chamber to the exterior environment of the loudspeaker enclosure, a... | 05/30/2006 |
| 6724904 | Microphone mounting assembly A mounting assembly for removably supporting a microphone in an operative position and in a manner which will protect the microphone against attenuating high impact phonetic peaks. A plurality of support assemblies are selectively attachable to one another to assume... | 04/20/2004 |
| 6604602 | Separable speaker cover box containing speaker system A novel speaker box system for a deep bass amplification consists of a front trumpet horned speaker cover box and a rear speaker box. The rear speaker box consists of a cylindrical box and a speaker installed at one end of the cylinder. The other side of ... | 08/12/2003 |
| 6035962 | Easily-combinable and movable speaker case An easily-combinable and movable speaker case includes two side boards, a front holed board, a speaker support board, an electric circuit board, a rear control board, a cap board, a bottom board, and a pull member. The two side boards are spaced apart par... | 03/14/2000 |
| 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 |
| 5631450 | Megaphone A megaphone includes a pair of hollow bodies which are assembled at a connecting portion to open and close freely, wherein a tuning part is formed by denting the center of a flat part of each hemiconical main part to provide a level face around the tuning... | 05/20/1997 |
| 5179255 | Baseball bat having the functions of resonators and microphones A baseball bat having the functions of resonators and microphones is designed to be hollow and has a receiver cup disposed at its inner top end in such a manner that a spring may be hooked to its bottom while the other end of the spring is hooked to a tun... | 01/12/1993 |
| 5094317 | Two-piece megaphone with ornamental member A two-piece megaphone assembly having a conically-shaped member and an ornamental headpiece which attaches by means of interlocking attachment lugs to the large diameter end of the conically-shaped member. The headpiece is comprised of two symmetrical hal... | 03/10/1992 |
| 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 |
| 4984653 | Loudspeaker arrangement The invention relates to a loudspeaker arrangement in which, in front of the loudspeaker (5) or another sound source, when viewed in the direction of the sound projection, two, preferably plane, sound guide surfaces (2,3) are disposed which, in a bow-like... | 01/15/1991 |
| 4967684 | Warning device The present invention pertains to a warning apparatus with respect to a ski-pole. The warning apparatus is comprised of a device for signaling that does not require the ski-pole to be seen in order for a signal provided by the signaling device to be notic... | 11/06/1990 |
| 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 |
| 4525604 | Horn loudspeaker with convex diaphragm A horn loudspeaker with a convex diaphragm in which the throat of the horn is formed by an assembly including the diaphragm, a cover plate for the diaphragm, a tapered plug, and a base, the plug and cover forming linear channels of equal length confrontin... | 06/25/1985 |
| 4447678 | Electracoustic transducer An electroacoustic two-way transducer assembly particularly for headphones and microphones comprises an electrostatic treble system having an electrostatic treble system disphragm and an electrodynamic system disposed under said electrostatic treble syste... | 05/08/1984 |
| 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 |
| 4283457 | Laminate structures for acoustical applications and method of making them A laminate structure for acoustical applications which comprises a porous, flexible, non-woven, needle punched mat of inherently non-burning, fine glass or other material fibers affixed as a facing to a sound absorbing, flame retardant, flexible backing s... | 08/11/1981 |
| 4187926 | Loudspeaker horn A loudspeaker horn has a throat section with a rectangular cross section to which the driver unit is coupled. The throat section has substantially parallel side walls joined together by diverging top and bottom walls. The horn has a rectangular mouth whic... | 02/12/1980 |
