Class 181/296 - Methods

Subclass of Class 181 - Acoustics
Definition: Subject matter comprising methods of attenuating sound.
No. of patents: 140
Last issue date: 05/24/2011

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Number	Title	Issue Date
7946385	Process for the production of an acoustically resistive structure, the acoustically resistive structure thus obtained, and coating using such a structure A process for the production of an acoustically resistive structure that can be inserted in an alveolar structure so as to obtain a coating for the acoustic treatment, whereby the acoustically resistive structure includes at least one porous layer (34) and at...	05/24/2011
7464791	Acoustic mats and methods for making the same Acoustic mats include a face layer and an absorptive layer having first and second surfaces wherein the second surface of the absorptive layer may be secured to said face layer. The mat further includes a plurality of discrete segments secured to the first surface o...	12/16/2008
7431128	Noise absorbing structure of instrument panel A noise absorbing structure of an instrument panel of a vehicle includes a first noise absorbing panel, provided in the instrument panel disposed in front of a driver seat of the vehicle, a second noise absorbing panel, provided in the instrument panel disposed in f...	10/07/2008
7410030	Soundproofing material for vehicle A soundproofing material for vehicle having a laminated structure comprising two sound absorbing layers and an interlayer interposed therebetween, characterized in that the interlayer is formed by bonding and laminating on the respective side of an air-impermeable f...	08/12/2008
7364015	Acoustical panel comprising interlocking matrix of set gypsum and method for making same An acoustical panel comprising a continuous phase of an interlocking set gypsum matrix and a method of preparing an acoustical panel are disclosed. ...	04/29/2008
7350620	Compact silencer There is disclosed a silencer for attenuating sound waves produced in a fluid that circulates through a fluid conveyer. The silencer comprises an expansion chamber that is in fluid communication with the fluid conveyer, and which carries sound waves there through; a...	04/01/2008
7328771	Zero acoustic splice fan case liner A liner assembly for a fan case includes a noise attenuation layer covered by a face sheet. The face sheet includes openings to the underlying noise attenuation layer. The face sheet and noise attenuation layer include acoustically transparent joints. The noise atte...	02/12/2008
7303048	Method for filtering ultrasonic noise within a fluid flow system A method is employed to attenuate ultrasonic noise propagating in a flow stream of a fluid flow system. In particular, the method attenuates the noise propagating between a noise source and a reference point in the flow stream (wherein the reference point and the no...	12/04/2007
7283425	Apparatus for measuring flow noise of water over a hydrophone A water flow noise measuring apparatus comprising: a frame; a beam comprising a distal and a proximal end, where the proximal end is pivotably coupled to the frame; a hydrophone capable of detecting water flow noise and generating water flow noise data, where the hy...	10/16/2007
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
7253218	Sound damping compositions and methods for applying and baking same onto substrates An applicator head for connection to a robotic device, and useful for applying a fluid material to a substrate. The applicator head comprises: (a) a body portion; (b) at least one material delivery system comprising an inlet, a fluid delivery cavity, and two or more...	08/07/2007
7248703	Systems and methods for adaptive noise cancellation A system (400) for reducing non-acoustic noise includes a primary sensor (420), at least one secondary sensor (410), a filter (415), and a summation unit (425). The primary sensor (420) measures pressure and produces a prima...	07/24/2007
7240768	Flapper finger valve A flapper finger valve assembly for use in an exhaust system. The flapper finger valve includes a tube having a plurality of orifices therethrough. The flapper finger valve assembly also includes a plurality of flapper finger valves generally having a C-shape wherei...	07/10/2007
7223455	Duct board with water repellant mat A duct board or duct liner comprises: an insulating layer formed from fibrous material bound with a resin binder, an outer facing layer adhered to an outer surface of the insulating layer, and a water repellant mat facing adhered to an interior surface of the insula...	05/29/2007
7207258	Weapon silencers and related systems Silencers are provided for a weapon having a combustion chamber and a barrel. The weapon is configured to launch a projectile with combustion gases generated in the combustion chamber. An exemplary silencer includes a proximal end and a distal end, the proximal end ...	04/24/2007
7198062	Fluid control valve A valve is provided for controlling a flow of a fluid between a first environment and a second environment. The valve includes a frame adapted to fit within a perimeter of an aperture in a divider separating the first environment from the second environment. The val...	04/03/2007
7169344	Method of reinforcing at least a portion of a structure A system and method for reinforcing at least a portion of a structural member, including at least one chamber or compartment having an interior portion which substantially conforms to the dimensions and geometry of the structural member being reinforced; and a reinf...	01/30/2007
7158644	Active noise control system A first rectifying net, a rectifying grid and a second rectifying net are attached, as a rectifying part upstream of a duct through which air for cooling flows. A noise detection microphone detects noise within the duct. An error detection microphone is placed in th...	01/02/2007
7137477	Sound absorbers The present invention relates to a sound absorber consisting of a first non-woven fabric facing towards the sound-emitting source having a layer thickness within a range of from 2 to 15 mm, a density within a range of from 50 to 500 kg/m3, a weight per su...	11/21/2006
7124599	Absorption pipe structure of compressor An absorption pipe structure of a compressor, capable of reducing vibration of the absorption pipe and making the machinery room small-sized, by making short the length of the absorption pipe connected with the compressor and forming the curved part formed in a prop...	10/24/2006
7063183	Apparatus and methods of forming sound attenuating laminates having fiber and mass layers Apparatus and methods are provided forming a sound attenuating laminate that has a decoupler fiber layer and a mass layer in opposing relationship with each other. The decoupler fiber layer and mass layer of the laminate are heated to the selected temperature in sub...	06/20/2006
7036328	Air conditioner An air conditioner which includes a plurality of indoor units to cool air of a plurality of rooms. Included is a plurality of branch refrigerant lines that each include a backflow prevention part provided at an end of the branch refrigerant line and/or a pulsation d...	05/02/2006
7028416	Noise attenuating drying apparatus for motor vehicles An air duct for a motor vehicle air dryer has an outer shell defining an inner surface. A porous, fluid permeable lining for attenuating noise caused by turbulent air flow through the air duct is positioned on the shell inner surface, and defines an inner surface. T...	04/18/2006
7000729	Five-layer sound absorbing pad: improved acoustical absorber An acoustical absorber, having the structure: scrim/film/batt/film/scrim. Preferably, the batt is made from about 60% to about 90% by weight natural fiber and about 10% to about 40% synthetic fiber. Also, a method of making the acoustical absorber is provided. Addit...	02/21/2006
6971475	Vehicle trim components with selectively applied foam and methods of making same Vehicle trim components are formed by applying a layer of material onto a mold surface and then selectively applying foam prior to molding operations. Selectively applying foam may include applying foam of different densities in multiple locations and/or applying fo...	12/06/2005
6966594	Vehicle trim panel and method of reducing BSR A vehicle trim panel including a structural frame portion having an inner surface for facing a vehicle body and an outer surface opposite the inner surface and a plurality of flexible projections extending from the inner surface of the structural frame portion and c...	11/22/2005
6966402	Acoustical heat shield A heat shield includes an inner portion, an outer portion, first and second insulating portions, and a deflecting portion. The inner portion includes a reflective material to reflect thermal energy that radiates from a heat/acoustic source. The outer portion include...	11/22/2005
6893711	Acoustical insulation material containing fine thermoplastic fibers The present invention relates an acoustical insulation material for sound attenuation containing a nonwoven web. Surprisingly, it has been discovered that an acoustical insulation material made from a nonwoven web of thermoplastic fibers having an average fiber diam...	05/17/2005
6824591	Air filter for an internal combustion engine An air filter for an internal combustion engine includes an air filter housing, the walls of which encompass a filter compartment in which a filter element is positioned, having an intake and an exhaust. Openings that can be sealed off or opened up based upon the op...	11/30/2004
6820923	Sound absorption system for automotive vehicles An automotive vehicle sound absorption system. An expandable material, such as an polymer-based foam, is disposed on a surface of a wall. Upon activation, the foam transforms, preferably during an automobile assembly operation, and remains bonded to surface for soun...	11/23/2004
6648100	Method of tuning acoustical absorption in a vehicle interior A vehicle seat cover is designed to facilitate acoustic energy absorption by forming in the cover an optimal size and arrangement of perforations based on at target noise frequency range, the perforations allowing the noise to pass through the cover into ...	11/18/2003
6615857	Modular flow control actuator The present invention is a flow control actuator capable of exciting a fluid via the coupling of edge tones generated along a wedge and resonance generated within a cavity. The invention consists of a resonance cavity and ejector port separated by a wedge...	09/09/2003
6567341	Boom system and its use to attenuate underwater sound or shock wave transmission The present invention relates to methods of attenuating underwater transmission of sound or shock waves as well as boom systems designed for such use. The boom system is characterized by a material (e.g., curtain or combination curtain and skirt) which ex...	05/20/2003
6371242	Noise attenuation panel In the manufacture of a noise attenuation panel for an aeroengine nacelle an adhesive film is applied to a front face of a cellular component of the panel. The adhesive film is caused to reticulate to the ends of the walls of the cells at the front face o...	04/16/2002
6371240	Anechoic chamber The modular anechoic panel system provides modular anechoic panel for construction of anechoic chambers particularly advantageous for use in sound testing and measurement. The modular anechoic panel incorporates into a single structural member the element...	04/16/2002
6290021	Method of manufacturing a sandwich board and a sound insulating structure A sound insulating structure (12) comprises first layer plates (30) arranged in coplanar and contiguous relationship in order to form a first structural layer, second layer plates (13) arranged in coplanar relationship in order to form a second structural...	09/18/2001
6248423	Acoustical and structural microporous sheet A microporous sheet having both acoustical and structural functionality and a process for producing the sheet. Construction of the sheet requires, first of all, providing a sheet capable of functioning as a structural element of a component. A laser devic...	06/19/2001
6216817	Damping structural substance and a damping coat forming method A vibration damped structure, which is excellent in vibration absorption and sound absorption effect, is provided by coating the surface of a structure to be damped with a mixture of molten photopolymerizable resin and a photopolymerization initiator and ...	04/17/2001
6167983	Process for production of tube profile element with swaged closed head end and muffler suspension produced thereby A process for production of a tube profile element having a swaged closed head end includes the steps of chamfering an unswaged end of a tube profile element having a first diameter to provide a chamfered end on the tube profile element having a chamfer a...	01/02/2001
6152260	Method of filling cavities in workpieces or semi-finished products and structural components parts for mounting on or in a motor vehicle Method for filling cavities in workpieces or semi-finished products is provided, in which thermally foamable powdered carbon is added in fixed locations into the cavity to be filled and is heated together with the workpiece or semi-finished product in suc...	11/28/2000

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Class 181/296 - Methods