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"I watched his countenance closely, to see if he was not deranged ... and I was assured by other senators after he left the room that they had no confidence in it."
U.S. Senator Smith of Indiana ; After seeing Samuel Morse demonstrate the telegraph.
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| Number | Title | Issue Date |
| 8181736 | Phase plug and acoustic lens for direct radiating loudspeaker A phase plugs or acoustic lens improves the directional audio performance of a loudspeaker. Application of the improved directional audio performance to a sound system in a listening area may improve the performance of the audio system. Configuration of the acoustic... | 05/22/2012 |
| 7770689 | Lens for concentrating low frequency ultrasonic energy Disclosed is an ultrasonic lens configuration permitting the production of an acoustic field from low frequency ultrasound waves with predictable regions of energy concentration. The lens comprises at least three adjacent convex surface contours. Each surface contou... | 08/10/2010 |
| 7316290 | Acoustic lens system A loudspeaker includes a frame, a magnet coupled to the frame and a diaphragm secured to the frame. An acoustic lens may be positioned in front of the diaphragm. An aperture extends through the acoustic lens. The acoustical directivity pattern of the loudspeaker may... | 01/08/2008 |
| 7278513 | Internal lens system for loudspeaker waveguides This invention provides a lens system for a loudspeaker. The loudspeaker may include a driver unit and a waveguide attached to the driver unit. The loudspeaker further may include a lens system. The lens system may include a plurality of plates. The plates may be po... | 10/09/2007 |
| 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 |
| 7266211 | Speaker grill A speaker grille is disposed in front of a speaker having a diaphragm and reproducing the sounds of 1 kHz and higher. The speaker grille is provided with a sound opening which includes a sound opening portion that opposes a region extending from the edge portion of ... | 09/04/2007 |
| 7204342 | Sound focus speaker of gas-filled sound lens attachment type A sound focus speaker adopting a gas-filled sound lens enhances efficiency of transferring sound from a source to target area and of protecting a spread of transferred sound. The sound focus speaker includes a gas-filled sound lens, sound sources for generating soun... | 04/17/2007 |
| 6936046 | Methods of using high intensity focused ultrasound to form an ablated tissue area containing a plurality of lesions A method of thermal ablation using high intensity focused ultrasound energy includes the steps of positioning an ultrasound emitting member, emitting ultrasound energy from the ultrasound emitting member, focusing the ultrasound energy, ablating with the focused ult... | 08/30/2005 |
| 6820718 | Acoustic reproduction device with improved directional characteristics A sound reproduction system is disclosed which minimizes unwanted acoustic reflections and the resulting comb-filter effects but which still maintains a broad and uniform directional characteristic throughout the region in the listening room in which listening posit... | 11/23/2004 |
| 6554826 | Electro-dynamic phased array lens for controlling acoustic wave propagation An electro-dynamic phased array acoustic lens having an array of cells, each of which may be separately controlled to alter characteristics of an incident acoustic wave. Because each cell of the acoustic lens controls the delay and amplitude of the acoust... | 04/29/2003 |
| 6533063 | Video equipment speaker device with acoustic lens In video equipment, a video equipment speaker device that is almost invisible from a viewer and capable of placing, toward the front of the center portion of the screen, an acoustic image from a speaker 2 provided on at least either an upper or lower port... | 03/18/2003 |
| 6527080 | Passive system for speech enhancement A passive system for speech enhancement in a motor vehicle includes a headliner adapted to be disposed in an occupant compartment of the motor vehicle. The passive system also includes at least one passive sound reflector disposed in or near the headliner... | 03/04/2003 |
| 6478109 | Laminated composite panel-form loudspeaker A laminated composite panel-form loudspeaker consists of a peripherally stiffened laminated composite radiating panel on which a preselected number of transducers are mounted and a rectangular frame carrying a flexible suspension device which supports the... | 11/12/2002 |
| 6435301 | Apparatus for the redistriabution of acoustic energy An apparatus for the redistribution of acoustic energy is provided which comprises a lens having a reflective surface defined by the surface of revolution (R1) of an elliptical arc (A1) rotated about a line (L) through an angle (댑) and the surface ... | 08/20/2002 |
| 6068080 | Apparatus for the redistribution of acoustic energy An apparatus for the redistribution of acoustic energy is provided which comprises a lens having a reflective surface defined by the surface of revolution R1 of an elliptical arc A1 rotated about a line L through an angle 댑 and the surface of revol... | 05/30/2000 |
| 5850060 | Acoustic lens device An acoustic lens device is provided for use in facilitating oral communication in a space which is acoustically challenged. The lens device includes at least one acoustic reflector for positioning proximate to a dashboard of a passenger portion of a trans... | 12/15/1998 |
| 5365024 | Acoustic lens system The acoustic lens system is used for ultrasonic imaging in an ultrasonic system which displays an image of an object while transmitting ultrasonic waves and receiving the ultrasonic waves reflected from the object, and has a half field angle ω expressed ... | 11/15/1994 |
| 5345045 | Acoustic lens An acoustic lens for the transformation of a planar wave into a spherical segment-shaped wave, and vice versa, is disclosed. In order to avoid aberrations, the lens is fashioned rotationally symmetrical relative to its center axis and biconcavely, the len... | 09/06/1994 |
| 5274709 | Speaker device for television receiver A speaker unit for a television receiver includes speakers SPL, SPR arranged at the back of a television screen surface, sound reflectors for reflecting the sound from the speakers substantially in a forward direction from the televi... | 12/28/1993 |
| 5190826 | Interlayers for use in sound-insulating laminated glasses An interlayer for use in sound-insulating laminated glasses which is in the form of a laminated film of two kinds of resin films (A) and (B), each comprising a polyvinyl acetal acetalized with an aldehyde having 6 to 10 carbon atoms for the film (A) or wi... | 03/02/1993 |
| 4970705 | Constant focal length acoustic lens A temperature compensation system that adjusts the temperature of an acoustic lens fluid in a prescribed manner to maintain the index of refraction of the fluid constant relative to the surrounding water thereby maintaining the focal length of the lens co... | 11/13/1990 |
| 4967873 | Acoustic lens apparatus In an acoustic lens apparatus of this invention, a lens surface formed on an ultarsonic medium has a longitudinal wave lens portion constituted by a first aspherical surface at its central area, and a transverse wave lens portion constituted by a second a... | 11/06/1990 |
| 4922594 | Method of making a focussing element for use in a lenseless focussed transducer A focussing element for use in a lenseless, focussed transducer for producing a semi-focussed, ultrasonic beam comprises a body formed of electrical insulating material and a plurality of piezoelectric elements disposed in one end of the body, each elemen... | 05/08/1990 |
| 4887692 | Noise reducing device for marine propulsion A number of embodiments of silencing devices for marine propulsion units using acoustical lenses that are positioned across either the air inlet device, the air exhaust device or both. The acoustical lenses direct the sound waves in such a way so as to ef... | 12/19/1989 |
| 4881618 | Acoustic lens for use in acoustic microscope An acoustic lens for use in an acoustic microscope including a solid state medium for propagating an acoustic wave having a wavelength λ and having opposed end surfaces, an electric-acoustic transducer applied on one end surface of the solid state medium... | 11/21/1989 |
| 4858720 | Noise reducing apparatus A noise reducing apparatus is disclosed, comprising a lens-type hollow body consisting of a plurality of inclined hollow tubular passages. The lens-type hollow body has a plane incident surface and a curved emission surface and the length L2 of... | 08/22/1989 |
| 4852682 | Underwater voice communicator An underwater communicator comprising a transmitter for transmitting acoustical energy between mediums having differing impedance. The transmitter includes first and second ends. The first end is exposed to a first medium while the second end is exposed t... | 08/01/1989 |
| 4852973 | Diffraction free arrangement Arrangements are disclosed for generating a well defined traveling wave beam substantially unaffected by diffractive spreading. In different embodiments, the beam can be an electromagnetic wave, particle beam, a transverse beam, a longitudinal beam such a... | 08/01/1989 |
| 4844198 | Plane wave focusing lens A lens incorporates two reflective shells. One shell's surface is generated when a parabola is rotated around a line which lies in the parabolic plane perpendicular to its axis of symmetry. The other shell's surface is generated when an ellipse is rotated... | 07/04/1989 |
| 4836328 | Omnidirectional acoustic transducer An enclosure for a transduction element incorporates a geometrically shaped acoustically reflective shell. This acoustically reflective shell is shaped so that the inner surface thereof is at a least a section of that shape generated when a parabolic stru... | 06/06/1989 |
| 4779241 | Acoustic lens arrangement An acoustic lens arrangement having at least one transducer for the generation and/or for the reception of a plane acoustic wavefield. The arrangement includes a focusing surface for focusing the acoustic wavefield in an object region and at least one med... | 10/18/1988 |
| 4726444 | Sound wave control device Disclosed herein is a sound wave control device which is shaped in a lens form or a prism form from an acoustically rigid porous material, wherein numerous paths having different path lengths are provided and the apparent medium density is varied. This se... | 02/23/1988 |
| 4651850 | Acoustic lens An acoustic lens for use in an ultrasonographic probe is made of a material including silicone rubber mixed with particles of titanium oxide having diameters ranging from 0.08 to 0.20 μm. The particles are mixed at a ratio in the range of 30 to 65 wt %.... | 03/24/1987 |
| 4562900 | Lens system for acoustic transducer array A lens system for directing and focussing acoustic energy from an array of acoustic transducers on a small target can be made lightweight, low in absorption and dispersion by incorporating plastic Fresnel lenses with prisms into a monolithic tray of the s... | 01/07/1986 |
| 4553629 | Ellipticized acoustical lens providing balanced astigmatism An ellipticized singlet azimuth versus elevation optimized and aperture eemized nonspherical acoustic lens antenna of very low or even minimal F-number providing balanced astigmatism for wide angle acoustical applications in underwater sound is described... | 11/19/1985 |
| 4550609 | Acoustic lens A device for focussing or collimating a beam of acoustic radiation comprises a body of acoustically transmissive material having first endface (12) coupled to a source of acoustic radiation (16, 18). The radiation is internally reflected by the side surfa... | 11/05/1985 |
| 4445380 | Selectable focus sphericone transducer and imaging apparatus An ultrasound imaging apparatus and transducer means which produces a converging beam pattern focused along the axis of the transducer with increasing beam concentration towards the furthest point of convergence of the beam pattern.... | 05/01/1984 |
| 4413704 | Ellipticized acoustical liquid filled lens providing balanced astigmatism An ellipticized singlet azimuth versus elevation optimized and aperture eemized nonspherical acoustic lens antenna of very low or even minimal F-number providing balanced astigmatism for wide angle acoustical applications in underwater sound is described... | 11/08/1983 |
| 4401859 | Directional microphone with high frequency selective acoustic lens A unidirectional dynamic microphone provided with a first sound path to the forward side of the diaphragm and a second sound path to the rear side of the diaphragm, a Helmholtz resonator disposed in the first sound path having a sound entrance, and a diff... | 08/30/1983 |
| 4387599 | Multiple field acoustic focusser The invention provides a highly focussed ultrasonic wave throughout a large depth of field without any mechanical motion. One embodiment of the invention providing two focussed fields includes a front to back arrangement of a converging lens, a transducer... | 06/14/1983 |
