Matches 201 - 250 out of 338 < 1 2 3 4 5 6 7 >
Match Document Document Title
4815050 Complaint tube low frequency sound attenuator  
An apparatus for attenuating low frequency sound in a high static pressure environment comprises a hollow, tube-shaped structure having two, free-bending spans disposed opposite each other and...
4787473 Sound attenuating box  
The propagation of sound in flow channels is attenuated by a sound attenuating box comprised of cell-like chambers each with a bottom, an outer plate and a partition with an opening spaced from the...
4782913 Constructional element with acoustic properties  
A three-dimensional, formable constructional element (1) with acoustic properties is provided, having a shell (2) with a low natural bending stiffness to which webs (3) are fixed so as to form a...
4759000 Acoustic energy absorbing material  
An acoustic energy absorbing baffle comprising a fluid containment means having an acoustic window means, a viscous fluid contained within said fluid containment, a porous material comprising...
4715473 Foam acoustic absorption member  
A foam acoustic absorption member having a stabilizing layer with perforations and, in order to obtain a simple, stable structural shape of homogeneous resistance to flow, the stabilizing layer (2)...
4705139 Sound insulation part for surfaces  
A sound insulation part for surfaces with known source-sink distribution, in particular in passenger spaces of motor vehicles, is provided, which is designed as a mass-spring system with...
4702046 Acoustical wall panel  
An acoustical wall panel for mounting on walls or similar surfaces includes a wooden support frame, low density fiberglass batts positioned within the support frame, and a generally rigid...
4683979 Co-oscillating, volume-changing resonator in the form of a silencer  
A co-oscillating, volume-changing resonator in the form of a silencer, includes a lens-shaped housing formed of a material having a given flexural stiffness, the housing being arched defining an...
4674595 Underwater acoustic pressure release baffle for depths to 2000 feet  
A neutrally buoyant, wide frequency range underwater acoustic baffle suite for extended depth operation comprising a laminated structure including a rigid inner separator sheet having a plurality...
4669573 Underwater acoustic baffle enhancer  
The lightweight underwater acoustic baffle with enhanced performance chareristics particularly at low frequencies is provided by a stiffened resistive screen means affixed in front of a compliant...
4667768 Sound absorbing panel  
In the present invention an improved sound absorbing panel is provided. The panel comprises an array of wall defining means configured to provide two or more contiguous hollow cells having adjacent...
4655496 Motor vehicle noise insulation  
A partition (4) for separating the engine compartment (2) from the passenger compartment (3) of a motor vehicle comprises a wall (5) and a covering (6) of noise-insulating material on the engine...
4641726 Composite structure and method of manufacturing it  
A panel having a cellular core and an acoustically semi-transparent facing is provided. The core, which may be a honeycomb, has cells opening to a face of the core. The facing is bonded to the face...
4630416 Acoustical panel  
A movable, prefabricated wall panel having a rigid rectangular frame. A core structure is disposed in the region bounded by the frame, which core structure preferably comprises at least one...
4628490 Wideband sonar energy absorber  
This invention relates to an acoustic energy absorbing material which abss sound energy underwater and its performance is independent of the surrounding hydrostatic pressure. It consists of a...
4615411 Sound-insulated flow duct and process for the manufacture thereof  
A sound-insulated flow duct is provided with walls made up of a composite of an elastic thermoplastic, predominantly closed-cell foam material as the outer layer and an open-cell, elastic soft foam...
4611687 Three-function acoustical panel  
Described is an acoustical panel to control sound emissions in facilities requiring sanitary conditions. The panel incorporates a moisture proof outer shell, one or more air pockets and a woven...
4605093 Device for absorption of sound waves  
A device having a high sound absorption ability and intended for use as floor, wall and/or ceiling facing in so-called echo-free rooms (10), i.e. in acoustic measuring rooms designed according to...
4600078 Sound barrier  
A sound barrier (22) comprising a pair of spaced apart members (24,26), a medium (34) disposed between the members capable of propagating sound waves, and one or more acoustical resonators (30)...
4583615 Method and apparatus for controlling noise  
The invention relates to a noise control device which is placed between a noise source and an area which is to be protected. The device includes at least one passageway through the body portion...
4562901 Sound absorptive structural block with sequenced cavities  
A sound absorbing block of molded structural material has a sequence of internal cavities that communicate with a region containing the sound to be suppressed through a first elongated slot located...
4560028 Sound absorbing wall lining  
In sound absorbing lining, conduits (4) are provided, filled with a viscous damping fluid, and are in contact by their ends facing towards the rigid supporting wall (1) to which the lining is...
4553631 Sound absorption method and apparatus  
A method of absorbing sound generated within a clean-room environment and the sound-absorbing panel for carrying out that method, wherein said sound absorbing panel comprises a fibrous core...
4550798 Acoustic panel and enclosure  
An acoustic enclosure (10) has interconnected sound reducing panels forming a substantially rectangular structure which is configured to house a computer printer. Each side (12,14) panel is a...
4548292 Reflective acoustical damping device for rooms  
An acoustical device for damping and absorption of certain frequencies in a room and including a surface which functions as a low pass filter to maintain low frequency absorptive properties without...
4531609 Sound absorption panel  
Two pelts of fiberglass are bonded together to form a sound absorption panel. One pelt is deformed to a sawtooth shape and the teeth of the sawtooth pelts are bonded into grooves in the other pelt...
4529637 Acoustical material  
The disclosure is directed broadly to a thin metal sheet containing a multitude of small openings therethrough. Typically, the sheet will contain at least 400 openings per square inch with the...
4522284 Composite panel structure  
A panel having a cellular core and an acoustically semi-transparent facing is provided. The core, which may be a honeycomb, has cells opening to a face of the core. The facing is bonded to the face...
4515239 Noise reduction lining  
The invention relates to a noise reduction lining of the kind for use in passenger compartments of automobiles for absorbing engine noise of five or six cylinder combustion engines, and comprises...
4509616 Acoustical liners  
An annular groove formed on the inner surface of the porous sheet of an acoustical aircraft or jet engine liner spaced from the front edge and adjacent to the adhesive bonding material serves to...
4496024 Sound absorption panel and method of making  
A sound absorption panel in which a honeycomb core exhibiting cell end planes has bonded to those planes a porous fiberglass pelt, a layer of thermoplastic material intermediate the core and the...
4475624 Honeycomb structure  
A septum (18) is installed at a desired depth within a section of honeycomb core (12) for use in a sound attenuation panels, the septum is sandwiched between two layers (20, 24) of support material...
4463049 Sound-absorbing wall-lining  
It should be possible to manufacture, in a simple manner, a sound-absorbing wall-lining (3) consisting of a material to be applied to the wall which needs lining, and a resilient layer (4, 5) of...
4449607 Soundproofing for a gas pipe, in particular for the fan jet of a turbojet, and equipment for its fabrication  
Soundproof lining for a gas pipe, in particular for a turbojet fan jet, of the type including a multiplicity of thin, perforated panels juxtaposed by tiling, as well as an intermediate layer...
4441581 Component for airborne-sound insulation  
A plate-component (1) which can be used for airborne-sound insulation has chambers (5, 6) filled with a pulverulent or granular, e.g. metallic material, whose chamber walls (2, 3, 4) at least...
4441580 Acoustical control media  
An acoustical control media includes an air impervious septum adjacent which there is positioned a relatively thick layer of low density filler material on the outside of which there is provided a...
4436179 Noise control apparatus  
A noise control apparatus for reducing a sound volume of a noise propagating from a noise source such as a railroad includes a sound arresting wall placed apart from the noise source. Means for...
4433751 Sound suppressor liner  
A sound suppressor liner for aircraft exhaust passages is described which is based on the Helmholtz resonator principle including an inlet passage leading into a closed cavity wherein the inlet...
4425981 Sound absorbing building component of synthetic resin sheeting  
A sound-absorbing building component for indoor paneling consisting of at least two superimposed sheets, preferably made of a synthetic resin. At least one of the sheets is provided with cup-shaped...
4421811 Method of manufacturing double layer attenuation panel with two layers of linear type material  
A method of manufacturing a double degree acoustic attenuation sandwich panel having a plurality of stacked components adhered together to form a unitary sandwich structure. The structure...
4421455 Duct lining  
A duct lining exposing a substantially smooth, liquid impermeable outer surface to fluid flowing therealong.
4421201 High efficiency broadband acoustic resonator and absorption panel  
A high efficiency broadband acoustic resonator and absorption panel used for reducing engine noise from high bypass fan jet engines mounted on an aircraft. The panel uses a single layer of cellular...
4416349 Viscoelastically damped reinforced skin structures  
Viscoelastically damped reinforced skin structures wherein a sandwich skin having a relatively thick core is supported by structural elements, such as stringers and frames, are disclosed. In one...
4410065 Multi-layer acoustic linings  
An acoustic lining for a flow duct has a first perforate skin fixed to an underlying sound-absorbing layer. The first perforate skin is overlain by a second perforate skin which forms the wall of...
4393631 Three-dimensional acoustic ceiling tile system for dispersing long wave sound  
An acoustic ceiling tile system is provided with individual tiles contoured in three dimensions in order to disperse sound energy over the entire audible range human hearing while also absorbing...
4373608 Tuned sound barriers  
A tuned sound barrier for machines which radiate sound primarily at a few constant, discrete frequencies includes an array of mechanical resonators distributed over the surface of a sound barrier....
4356880 Acoustical reflectors  
A sonic reflector comprising three mutually perpendicular walls of sound reflective material each of a generally right triangular shape. Plural arrays of such reflectors provide acoustical panels...
4353768 Method for constructing a lightweight resistive screen for underwater sound absorption  
A method for preparing a resistive screen for underwater sound absorption consisting of a metallic honeycomb structure, adding a thermosetting plastic material to the cells within said structure,...
4347912 Airborne-sound-absorbing wall or ceiling paneling  
Airborne-sound-absorbing wall or ceiling paneling comprises a perforated plate having a hole-area proportion L and a nonwoven fabric bonded thereto by a discontinuously distributed adhesive layer....
4340129 Acoustical laminate construction and attenuated systems comprising same  
Disclosed herein is a flexible acoustical laminate construction which can be applied to noisy enclosures in order to attenuate noise therein. The construction of the invention finds particular use...
Matches 201 - 250 out of 338 < 1 2 3 4 5 6 7 >