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 |
| 7529382 | High fidelity loudspeaker A small and highly efficient loudspeaker, capable of handling high power, yet capable of being manufactured at reasonable cost, uses energy absorbing surfaces on a rear side of its diaphragm and as part of an enclosure that is integrated with its frame. ... | 05/05/2009 |
| 7280668 | Ceramic metal matrix diaphragm for loudspeakers This invention provides a method of manufacturing speaker diaphragm for a loudspeaker that has a composite material formed of two layers of ceramic material separated by a light metal substrate and where the core is formed by stamping a sheet of standard gauge alumi... | 10/09/2007 |
| 7218749 | Method for sound reproduction and pillar loudspeaker The invention relates to a method for sound reproduction and a loudspeaker, in which a vibrating diaphragm controlled by an operating device produces sound in the air surrounding it on the first side, and in which acoustic feedback is prevented by preventing the pas... | 05/15/2007 |
| 7203332 | Magnet arrangement for loudspeaker An electro-dynamic loudspeaker includes a frame, a plurality of magnets and a diaphragm. The frame includes a molded plastic body. The magnets may be molded into the frame in a determined configuration. The frame is mechanically coupled to the diaphragm such that th... | 04/10/2007 |
| 7167573 | Full range loudspeaker An edge-driven diaphragm loudspeaker driver is configured such that the suspension system of the driver is connected to the voice coil rather than to the diaphragm. Thus, the diaphragm in the loudspeaker is free of suspension systems connected to or extending from t... | 01/23/2007 |
| 7106881 | Speaker A speaker 300 is formed using a plate such as a mobile phone display window 310 as a vibrating element. At least two dynamic actuators 950 are positioned behind the edges of the window 310 to actuate the window 310 through its boun... | 09/12/2006 |
| 6956953 | Electroacoustic transducer with field replaceable diaphragm carrying two interlaced coils, without manipulating any wires The present invention is directed to a diaphragmatic (planar) electroacoustic transducer that forms a complete sound radiating transducer and provides high efficiency and linearity. The diaphragm is easily exchangeable and rectangular in shape, and may be made of ve... | 10/18/2005 |
| 6931140 | Electro-acoustic transducer with two diaphragms The present invention relates to an electro-acoustic transducer suitable for applications within mobile communication equipment and hearing aids. The transducer comprises two diaphragms positioned on opposite sides of a magnetic circuit having two magnetic gaps. Whe... | 08/16/2005 |
| 6563934 | Mechanically tunable diaphragm using nickel titanium memory metal A diaphragm includes a vibratory membrane and at least one nickel titanium memory metal member having a shape that can be mechanically adjusted with a heating signal. The mechanical adjustment of the at least one nickel titanium memory metal member tunes ... | 05/13/2003 |
| 6404897 | Ceramic metal matrix diaphragm for loudspeakers A method of manufacturing speaker diaphragm for a loudspeaker that has a composite material formed of two layers of ceramic material separated by a light metal substrate and wherein the core is formed by stamping a sheet of standard gauge aluminum to form... | 06/11/2002 |
| 6327372 | Ceramic metal matrix diaphragm for loudspeakers A speaker diaphragm for a loudspeaker that has a composite material formed of two layers of ceramic material separated by a light metal substrate with the percentage ratio of the thickness of the ceramic layers to the light metal substrate being in the ra... | 12/04/2001 |
| 6222931 | High power acoustical transducer An electro-acoustic transducer comprises a metal single-piece blade diaphragm having a very good heat conductivity and mechanical characteristics, the metal blade of which is resiliently suspended and supports the acoustical current wire fixed at the cent... | 04/24/2001 |
| 5933512 | Double cone-type loudspeaker A double cone-type loudspeaker which comprises a subcone made of highly heat-conductive material, attached to the front of the main cone and to a voice coil bobbin made of highly heat-conductive material. Heat generated in the coil portion of the voice co... | 08/03/1999 |
| 5212736 | Ribbon speaker A vibrating diaphragm is disposed in a magnetic gap. The diaphragm comprises two organic films superimposed on each other, and two metal films overlaid on the organic films, respectively. One of the organic films has a smaller polarization and the other o... | 05/18/1993 |
| 5195143 | Acoustical ribbon transducer loudspeaker system A loudspeaker system using ribbon transducer elements wherein the ribbon elements of the high and mid-range transducer units form a plurality of conductive circuits separated by spaces, or cuts, therebetween which have substantially smooth, undulating wav... | 03/16/1993 |
| 5021613 | Ribbon loudspeaker A ribbon loudspeaker is provided by a first set of three rows of parallel spaced apart magnets disposed on a first plate, a second set of three rows of parallel spaced apart magnets disposed on a second plate, a diaphragm having a U-shaped electric curren... | 06/04/1991 |
| 4924504 | Audio speaker An audio full range speaker which achieves the propogation of a peaked wavefront from the diaphragm instead of generating a substantially planar wavefront as in the case of the common speaker construction utilizing a diaphragm driven as a piston. The spea... | 05/08/1990 |
| 4709392 | Dome speaker with a diaphragm having at least one elongated cut-out portion A dome speaker comprising a dome-shaped diaphragm formed of a highly rigid material such as titanium or a titanium alloy, and having at least one elongated cut-out portion which varies the rigidity of the diaphragm and prevents a dip in the anti-resonance... | 11/24/1987 |
| 4591667 | Dome speaker with cut-out portions in the voice coil bobbin A structure for a dome speaker includes a dome-shaped diaphragm formed of a high rigidity material and having an outer periphery, a voice coil bobbin secured at a top end thereof to the outer periphery of the diaphragm, a voice coil mounted about the bobb... | 05/27/1986 |
| 4471172 | Planar diaphragm transducer with improved magnetic circuit A planar diaphragm type magnetic transducer with magnetic circuit wherein the magnet strips on the soft iron plate and confronting the diaphragm are arranged in a sequence south, north, north, south, south, north, north, south, et seq. The magnet strips a... | 09/11/1984 |
| 4471173 | Piston-diaphragm speaker A planar diaphragm type magnetic transducer with an acoustically transparent magnetic backing, and a diaphragm overlying and spaced from the magnetic backing, the magnetic backing having magnetized strips lying parallel to each other and adjacent magnetiz... | 09/11/1984 |
| 4395592 | Ribbon loudspeaker A ribbon loudspeaker is suitable for incorporation into a sound reproduction system without additionally requiring a transformer or series resistor. In one form in which the loudspeaker is bi-directional, a sound reproduction ribbon is received in a pair ... | 07/26/1983 |
| 4220831 | Intrusion sensing device An intrusion sensing device includes a sound frequency discriminating micophone having a diaphragm coupled to the atmosphere through a closed end resonating chamber having a length equal to one quarter the median wavelength of a relatively narrow band of ... | 09/02/1980 |
| 4190746 | Diaphragm material for moving coil loudspeaker, may be laminated or integral with surround A diaphragm for a moving evil loudspeaker is formed of a material which has a mechanical "0"value of from 7 to 12, a Youngs modulus of from 8.5 to 17.5 × 105 KN/M2 and a density of from 0.85 to 1.05 g/cc. The diaphragm forming mate... | 02/26/1980 |
| 4001522 | Ribbon type loudspeaker According to the invention, the ribbon type loudspeaker comprises permanent magnets defining a magnetic system and sound reproducing ribbons extending in the working gaps between the pole pieces of the permanent magnets. The sound reproducing ribbon is ma... | 01/04/1977 |
