Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 7275621 | Skew horn for a loudspeaker A horn including a substantially flat coupling flange defining a coupling flange plane, a substantially planar mouth defining a mouth plane, an elongated throat extending between the coupling flange and the mouth, a transducer for generating a sonic output operation... | 10/02/2007 |
| 7178629 | Electroacoustic public address unit with acoustic horn or waveguide A horn or waveguide public address unit, enabling to adapt the dispersion characteristics of the horn or waveguide. The unit is provided with at least one profiling component (21a, 21b) constituting a removable dispersion shaper, capable ... | 02/20/2007 |
| 7130438 | Acoustic enclosure for single audio transducer An acoustic enclosure for a single sound transducer has sound pressure apertures near the end where the transducer is located, and sound apertures in a wall at the other end. The sound apertures enable the low, mid-range, and high frequency sounds to exit the enclos... | 10/31/2006 |
| 6766027 | Elliptical flushmount speaker An elliptical speaker system is provided for in-wall/in-ceiling mounting. The speaker system comprises an elliptical speaker frame or bracket defining a speaker front plane having a generally arcuate inner surface. First and second speaker components are mounted wit... | 07/20/2004 |
| 6335974 | Speaker system for television receiver with sound ducts and perforated panels An audio apparatus for an equipment relates to an improvement of the sound quality in an acoustic apparatus of the equipment in which for an equipment having a woofer (4) and a tweeter (5), the acoustic apparatus (10) of the equipment includes a panel por... | 01/01/2002 |
| 5837890 | Jet engine test cell structure A jet engine test cell capable of dissipating infrasound. The test cell includes an engine test section, an augmentor and an exhaust stack having a structure near its open end for dissipating infrasound.... | 11/17/1998 |
| 5351220 | Moving-coil electrodynamic electroacoustical transducer The present invention involves a moving-coil electrodynamic electroacoustical transducer, comprising a disk made of a hard, nonmagnetic material (12), which is superimposed on the diaphragm (11) and has openings for the output of sound, a power-factor-imp... | 09/27/1994 |
| 5146434 | Sound focusing device A sound focusing device for use with a siren. The device is comprised of an adjustable baffle or damper reducing the velocity of air or sound eminating from a siren. The baffle or damper is positioned internal to the siren. A conical sound focusing trumpe... | 09/08/1992 |
| 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 |
| 4419545 | Electret transducer An electret transducer comprising a diaphragm (3) arranged between first (1 or 1') and second electrodes with at least one electrode (2) arranged at some distance from the diaphragm as a stationary electrode formed with holes (5). An air gap (4) is formed... | 12/06/1983 |
| 4194590 | Loudspeaker horn with adjustable angle of dispersion A loudspeaker horn, which is divided into three segments, is provided with a valve for projecting sound either through the central segment or through all of the segments, said valve being adjustable from the front of the loudspeaker by a knob which has ma... | 03/25/1980 |
