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Class Information
Number: 381/338
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Having acoustic wave modifying structure > With tubular waveguide or resonant element
Description: Subject matter for conducting sound through either a) a hollow cylinder or b) one or more hollow, acoustically resonant means, such as a hollow reed.










Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8615097 Waveguide electroacoustical transducing Dec. 24, 2013
8600092 Telescopic loudspeaker Dec. 3, 2013
8588449 Audio driver Nov. 19, 2013
8548184 Constant coverage waveguide Oct. 1, 2013
8538059 Ear speaker device Sep. 17, 2013
8528690 Sound effect amplication diffuser Sep. 10, 2013
8532325 Earphone device with bass adjusting function Sep. 10, 2013
8511165 Electromagnetic acoustic transducer (EMAT) combined with piezoelectric transducer (PZT) for dual mode ultrasonic inspection Aug. 20, 2013
8511422 Flexible multiple speaker support apparatus Aug. 20, 2013
8515116 Headphones with waveguider Aug. 20, 2013
8503709 Portable audio system having waveguide structure Aug. 6, 2013
8489214 Dock without a power source for digital devices Jul. 16, 2013
8477954 Controlling audio signals Jul. 2, 2013
8447055 Passive directional acoustic radiating May. 21, 2013
8434493 Adjustable mouth shield device May. 7, 2013
8422720 Speaker arrangement Apr. 16, 2013
8406445 Loudspeaker system with extended constant vertical beamwidth control Mar. 26, 2013
8401216 Acoustic traveling wave tube system and method for forming and propagating acoustic waves Mar. 19, 2013
8385575 Reflex enclosure Feb. 26, 2013
8385577 Fixing a sound tube in a hearing apparatus Feb. 26, 2013
8351629 Waveguide electroacoustical transducing Jan. 8, 2013
8351639 Multi-directional sound emission system Jan. 8, 2013
8351640 Multi-directional sound emission means and multi-directional sound emission system Jan. 8, 2013
8351631 Bass sound amplifying enclosure, woofer including the same, and electronic device including the woofer Jan. 8, 2013
8351630 Passive directional acoustical radiating Jan. 8, 2013
8345909 Loudspeaker assembly Jan. 1, 2013
8345908 High output loudspeaker Jan. 1, 2013
8331604 Electro-acoustic conversion apparatus Dec. 11, 2012
8325959 Microphone apparatus with increased directivity Dec. 4, 2012
8284976 Sound reproduction with improved performance characteristics Oct. 9, 2012
8275164 Speaker enclosures Sep. 25, 2012
8270637 Headset systems and methods Sep. 18, 2012
8265307 Acoustic transducer Sep. 11, 2012
8254613 Speaker apparatus Aug. 28, 2012
8243971 Behind-the-ear hearing device having an external, optical microphone Aug. 14, 2012
8213632 Electroacoustic transducer and ear speaker device Jul. 3, 2012
8194904 Speaker system with broad directivity Jun. 5, 2012
8175311 Electroacoustic waveguide transducing May. 8, 2012
8170256 Microphone assembly for minimizing acoustic feedback from a loudspeaker May. 1, 2012
8170254 Low profile loudspeaker May. 1, 2012
8160285 Waveguide unit Apr. 17, 2012
8151929 Acoustic waveguide vibration damping Apr. 10, 2012
8155363 Electrical horn Apr. 10, 2012
8150094 Electroacoustic transducer Apr. 3, 2012
8132642 Speaker system Mar. 13, 2012
8130976 Bandpass box in the supporting structure of a vehicle Mar. 6, 2012
8130987 Speaker system with a plurality of openings in side walls of each of two speaker boxes Mar. 6, 2012
8126189 Multi-directional flat speaker device Feb. 28, 2012
8111854 Methods and apparatus for sound production Feb. 7, 2012
8111853 Dual mode earphone with acoustic equalization Feb. 7, 2012

1 2 3 4 5










 
 
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