Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7936893 | Hearing aid In a hearing aid, a main body case has a fitting-use first communication terminal provided inside the main body case, so that the first communication terminal can be visually checked when the battery case is removed by turning, and the battery case has a first locki... | 05/03/2011 |
| 7760899 | Subwoofer with cascaded array of drivers arranged with staggered spacing A single folded, expanding horn loudspeaker reproduces low frequency audible sound at high power output levels. A compact enclosure houses a plurality of identical transducers, characterized by small vibrational surface areas. The throats for each transducer into th... | 07/20/2010 |
| 7454030 | Subwoofer with cascaded linear array of drivers A single folded, expanding horn loudspeaker reproduces low frequency audible sound at high power output levels. A compact enclosure houses a plurality of identical transducers, characterized by small vibrational surface areas. The throats for each transducer into th... | 11/18/2008 |
| 7272236 | Speaker assembly for a television cabinet A speaker housing for mounting at least one speaker therein is disclosed. The speaker housing includes a speaker enclosure sealed to a speaker cover. The speaker enclosure includes an opening for sealing a connector attached to a crossover printed circuit board asse... | 09/18/2007 |
| 7252176 | Reflex-ported folded horn enclosure A low frequency exponential/hyperbolic hybrid folded horn enclosure intended for use in proximity with at least one planar surface, such as a floor, ceiling, or wall, with access to the horn throat from the top of the enclosure. The horn is bifurcated at the throat ... | 08/07/2007 |
| 7252175 | Speaker apparatus and manufacturing method of speaker apparatus A speaker apparatus is a bass-reflex type woofer used in a speaker system, and includes a body portion for housing a speaker unit and a bass-reflex port mounted and fixed in the body portion. Further, in the speaker apparatus, a protrusion for temporarily fastening ... | 08/07/2007 |
| 7233677 | Top-loading folded corner horn A low frequency exponential horn enclosure intended for corner use with access to the horn throat and entire volume of the back chamber from the top of the enclosure, allowing operation as either a front or back loaded horn. The horn is bifurcated at the throat and ... | 06/19/2007 |
| 7190801 | Horn loudspeaker A horn loudspeaker includes a horn housing having a top wall, an inner surrounding wall that extends downwardly from the top wall, a bottom wall that extends laterally and outwardly from the inner surrounding wall, and an outer surrounding wall that extends upwardly... | 03/13/2007 |
| 7177439 | Methods and apparatus for dissipating heat in a voice coil The present invention is directed to methods and apparatus for dissipating heat in a voice coil of a loudspeaker, where at least one of: a bobbin having a substantially cylindrical shaped wall member is operable to support the voice coil, and the wall member include... | 02/13/2007 |
| 7177437 | Multiple aperture diffraction device A horn assembly for high frequency acoustic speakers. In an array of speakers, a spacing between adjacent speakers needs to be less than the wavelength of sound being emitted in order to combine effectively. For high frequency sound, a relatively small wavelength im... | 02/13/2007 |
| 7142680 | Multiple waveguide coaxial ceiling loudspeaker A flush mountable ceiling speaker (10) with individual coaxial waveguides (20, 22) for both the lower and high-frequency transducers (11, 12). The lower frequency radiation is combined with the sonic energy radiated by the high-frequency transdu... | 11/28/2006 |
| 7039212 | Weather resistant porting A port for a loudspeaker is disclosed which is sufficiently weather resistant for long term outdoor use and which prevents debris, insects and other vermin from entering the loudspeaker and which is compact and efficient. ... | 05/02/2006 |
| 6973994 | Apparatus for increasing the quality of sound from an acoustic source An apparatus for increasing the quality of sound from an acoustic source comprises in one embodiment a hollow enclosure, an acoustic source, an acoustic guide, a pair of acoustic inlet openings, a pair of acoustic exit openings, and pair of acoustic paths, wherein t... | 12/13/2005 |
| 6975735 | Sound collecting device minimizing electrical noise A sound collecting device is provided which is designed to minimize adverse effects on an output caused by exposure of an electroacoustic transducer to the air. The device includes an electroacoustic transducer and a vibrating circuit. The transducer is exposed to t... | 12/13/2005 |
| 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 |
| 6904157 | Structure around a speaker unit and applied electric or electronic apparatus thereof A compact lightweight speaker system without a resonance box that can reproduce the original sound with high fidelity. A speaker unit is located on a baffle board with a vibration absorbing member between a frame of the speaker unit and the baffle board. Furthermore... | 06/07/2005 |
| 6754360 | Signal-horn A signal-horn has an electromagnetically actuated oscillating membrane coupled to an acoustic amplifier having a volute wound duct formed of a first length with generally constant section having an inlet for the sound signal and a second length with variable section... | 06/22/2004 |
| 6658127 | Speaker system having an amplifying horn Disclosed is a speaker system that can be advantageously used in a television set. The speaker system has a support member which is provided with a partition wall and mounted on both sides of the television cabinet. A speaker is securely installed in the ... | 12/02/2003 |
| 6634455 | Thin-wall multi-concentric sleeve speaker An acoustic transmission line speaker enclosure with concentric cylindrical structures establishes acoustic coupling between a rear-traveling sound wave and a surrounding air mass. Inherent rigidity or high bending resistance of the cylindrical structure ... | 10/21/2003 |
| 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 |
| 6389144 | Sound field equalizing apparatus for speaker system A sound field equalizing apparatus for a speaker system which is capable of widening a region in which it is possible to effectively hear a sound field. The apparatus includes a sound field equalizing member disposed in a dispersing hole formed in a cabin... | 05/14/2002 |
| 6144309 | Alarm device with multiple indicators and flameproof housing An alarm device 10 incorporates a sounder 11 and a strobe 12. The sounder and the strobe are controlled by a circuit board 17 that is located within a single flameproof housing 13. A pressure unit 23 produces the sound for the device with the sound passin... | 11/07/2000 |
| 6127918 | Buzzer with a sound film and equalizing or whirlpool sound mechanism A buzzer includes a base with an upper opening, a vibrating plate fixed on the upper opening of the base, a sound film fixed flatly on the vibrating plate, and an equalizing or whirlpool sound mechanism for transmitting the sound produced by the vibrating... | 10/03/2000 |
| 6078676 | Speaker system with a three-dimensional spiral sound passage A compact speaker system is capable of reproducing a heavy bass sound with a superior transition characteristic. A sound radiated from a speaker unit passes through a three-dimensional spiral sound passage formed by a coaxial dual-tube structure provided ... | 06/20/2000 |
| 6035051 | Sound apparatus A sound apparatus capable of obtaining a clear sound (audio image) irrespective of a position of a speaker portion to be provided in the sound apparatus. The sound apparatus includes a speaker portion and a plurality of sound guides each of which has one ... | 03/07/2000 |
| 5970158 | Compact horn speaker A compact horn speaker suitable for use on emergency vehicles has a rear-facing motor circuit, a horn plate, and a mouth section. The horn plate has a plurality of horns folded therein in a plane perpendicular to the longitudinal direction of the speaker.... | 10/19/1999 |
| 5898788 | Loudspeaker system A loudspeaker system capable of minimizing interference of sound waves and increasing bass sound amplification efficiency by collecting and amplifying only a portion of the sound waves radiated from the rear of a loudspeaker. The loudspeaker system includ... | 04/27/1999 |
| 5896460 | Speaker A speaker has a substantially reduced size, is efficient in the low sound range and is unidirectional relative to the plane of installation or support of the speaker. The speaker includes a vibrator having a semispherical vibrating body made of a piezoele... | 04/20/1999 |
| 5822443 | Speaker system for a television A speaker system for a television includes a speaker provided in the television; a front amplifying member for amplifying sound waves radiated forward of the speaker; and a rear amplifying member for amplifying a portion of sound waves radiated rearward o... | 10/13/1998 |
| 5815589 | Push-pull transmission line loudspeaker A loudspeaker system having a multiple driver array arranged in a push-pull configuration is loaded into an acoustic transmission line ported to the outside of the loudspeaker enclosure. The transmission line is preferably tapered and is filled with acous... | 09/29/1998 |
| 5367576 | Horn speaker A horn speaker has a cabinet, a speaker body mounted in the cabinet, a horn including at least one horn piece, and threaded attachment bolts. The attachment bolts detachably attach the cabinet, speaker body and horn piece together in such a manner that th... | 11/22/1994 |
| 5012889 | Speaker enclosure A loudspeaker enclosure accommodates at least one speaker in the front wall of the enclosure. The interior of the enclosure is divided into two smaller chambers by means of a partition inclined with respect to the front and rear walls. One such chamber is... | 05/07/1991 |
| 4982436 | Dual horn folded soundpath loudspeaker A loudspeaker having two horns defining two soundpaths passing therethrough an input for connection to a driver and an output for broadcasting an acoustic signal is shown to include a central channel connected at one end to the input, the soundpaths being... | 01/01/1991 |
| 4979219 | Piezoelectric speakers A piezoelectric speaker comprises a drive unit having an auxiliary diaphragm bonded with a piezoelectric transducer element for producing sound thereby and a horn member having a resonance device including a reflection cover defining a plurality of first ... | 12/18/1990 |
| 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 |
| 4963855 | Warning sound generating device A warning sound generating device includes a sound source member and an enclosure for protecting the sound source member. A front wall of the enclosure and a sound emitting portion of the sound source member face each other. The front wall of the enclosur... | 10/16/1990 |
| 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 |
| 4860367 | Low frequency loud speaker A low frequency loud speaker is disclosed for use in a room at the intersection of two, mutually perpendicular planes, such as a ceiling and a wall, a floor and a wall or two walls. The speaker has a back air chamber within which an electrically-driven di... | 08/22/1989 |
| 4853964 | Electroacoustic apparatus for reproducing lowest to medium frequencies Electroacoustic apparatus for reproducing lowest to medium frequencies being provided with a housing wherein a folded exponential horn combined with a loudspeaker is defined having five horn element walls lengthening the horn with good exponential form to... | 08/01/1989 |
| 4850452 | Loudspeaker structure One or more up-firing woofer loudspeakers (12 or 22) are mounted atop a truncated pyramidal enclosure (1 or 21). A down-firing tweeter (5 or 25) is aligned above the woofer. A sound-reflecting sphere (4 or 24) is disposed between the woofer and the tweete... | 07/25/1989 |
