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Classification Resources
 
Class   381ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES
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[List of Pre Grant Publications for class 381 subclass 1][List of Patents for class 381 subclass 1]1 BINAURAL AND STEREOPHONIC
 [List of Pre Grant Publications for class 381 subclass 54][List of Patents for class 381 subclass 54]54 HELIUM SPEECH
 [List of Pre Grant Publications for class 381 subclass 55][List of Patents for class 381 subclass 55]55 AUDIO TRANSDUCER PROTECTION CIRCUITRY
[List of Pre Grant Publications for class 381 subclass 56][List of Patents for class 381 subclass 56]56 MONITORING OF SOUND
[List of Pre Grant Publications for class 381 subclass 58][List of Patents for class 381 subclass 58]58 MONITORING/MEASURING OF AUDIO DEVICES
[List of Pre Grant Publications for class 381 subclass 61][List of Patents for class 381 subclass 61]61 SOUND EFFECTS
 [List of Pre Grant Publications for class 381 subclass 66][List of Patents for class 381 subclass 66]66 DEREVERBERATORS
 [List of Pre Grant Publications for class 381 subclass 67][List of Patents for class 381 subclass 67]67 STETHOSCOPES, ELECTRICAL
[List of Pre Grant Publications for class 381 subclass 312][List of Patents for class 381 subclass 312]312 HEARING AIDS, ELECTRICAL
 [List of Pre Grant Publications for class 381 subclass 70][List of Patents for class 381 subclass 70]70 ARTIFICIAL LARYNX, ELECTRICAL
[List of Pre Grant Publications for class 381 subclass 71.1][List of Patents for class 381 subclass 71.1]71.1 ACOUSTICAL NOISE OR SOUND CANCELLATION
 [List of Pre Grant Publications for class 381 subclass 72][List of Patents for class 381 subclass 72]72 HEARING PROTECTORS, ELECTRICAL
 [List of Pre Grant Publications for class 381 subclass 73.1][List of Patents for class 381 subclass 73.1]73.1 SOUND OR NOISE MASKING
 [List of Pre Grant Publications for class 381 subclass 74][List of Patents for class 381 subclass 74]74 HEADPHONE CIRCUITS
 [List of Pre Grant Publications for class 381 subclass 75][List of Patents for class 381 subclass 75]75 MEGAPHONES
 [List of Pre Grant Publications for class 381 subclass 76][List of Patents for class 381 subclass 76]76 LECTERNS
[List of Pre Grant Publications for class 381 subclass 77][List of Patents for class 381 subclass 77]77 ONE-WAY AUDIO SIGNAL PROGRAM DISTRIBUTION
 [List of Pre Grant Publications for class 381 subclass 86][List of Patents for class 381 subclass 86]86 VEHICLE
[List of Pre Grant Publications for class 381 subclass 87][List of Patents for class 381 subclass 87]87 HAVING NON-ELECTRICAL FEATURE (E.G., MOUNTING)
 [List of Pre Grant Publications for class 381 subclass 92][List of Patents for class 381 subclass 92]92 DIRECTIVE CIRCUITS FOR MICROPHONES
 [List of Pre Grant Publications for class 381 subclass 93][List of Patents for class 381 subclass 93]93 FEEDBACK SUPPRESSION
[List of Pre Grant Publications for class 381 subclass 94.1][List of Patents for class 381 subclass 94.1]94.1 NOISE OR DISTORTION SUPPRESSION
 [List of Pre Grant Publications for class 381 subclass 95][List of Patents for class 381 subclass 95]95 MICROPHONE FEEDBACK
 [List of Pre Grant Publications for class 381 subclass 96][List of Patents for class 381 subclass 96]96 LOUDSPEAKER FEEDBACK
 [List of Pre Grant Publications for class 381 subclass 97][List of Patents for class 381 subclass 97]97 INCLUDING PHASE CONTROL
[List of Pre Grant Publications for class 381 subclass 98][List of Patents for class 381 subclass 98]98 INCLUDING FREQUENCY CONTROL
[List of Pre Grant Publications for class 381 subclass 104][List of Patents for class 381 subclass 104]104 INCLUDING AMPLITUDE OR VOLUME CONTROL
 [List of Pre Grant Publications for class 381 subclass 110][List of Patents for class 381 subclass 110]110 VOICE CONTROLLED
[List of Pre Grant Publications for class 381 subclass 111][List of Patents for class 381 subclass 111]111 CIRCUITRY COMBINED WITH SPECIFIC TYPE MICROPHONE OR LOUDSPEAKER
 [List of Pre Grant Publications for class 381 subclass 118][List of Patents for class 381 subclass 118]118 WITH MUSICAL INSTRUMENT
 [List of Pre Grant Publications for class 381 subclass 119][List of Patents for class 381 subclass 119]119 WITH MIXER
[List of Pre Grant Publications for class 381 subclass 120][List of Patents for class 381 subclass 120]120 WITH AMPLIFIER
 [List of Pre Grant Publications for class 381 subclass 122][List of Patents for class 381 subclass 122]122 HAVING MICROPHONE
 [List of Pre Grant Publications for class 381 subclass 123][List of Patents for class 381 subclass 123]123 SWITCHING
[List of Pre Grant Publications for class 381 subclass 150][List of Patents for class 381 subclass 150]150 ELECTRO-ACOUSTIC AUDIO TRANSDUCER
 [List of Pre Grant Publications for class 381 subclass 151][List of Patents for class 381 subclass 151]151 Subclass 151 indent level is 1 Body contact wave transfer (e.g., bone conduction earphone, larynx microphone)
 [List of Pre Grant Publications for class 381 subclass 152][List of Patents for class 381 subclass 152]152 Subclass 152 indent level is 1 Driven diverse static structure (e.g., wall, sounding board)
[List of Pre Grant Publications for class 381 subclass 337][List of Patents for class 381 subclass 337]337 Subclass 337 indent level is 1 Having acoustic wave modifying structure
 [List of Pre Grant Publications for class 381 subclass 161][List of Patents for class 381 subclass 161]161 Subclass 161 indent level is 1 With mechanical amplifier arrangement
 [List of Pre Grant Publications for class 381 subclass 162][List of Patents for class 381 subclass 162]162 Subclass 162 indent level is 1 Detail of mechanical vibration coupling to transducer (e.g., tuned vibrating element)
 [List of Pre Grant Publications for class 381 subclass 163][List of Patents for class 381 subclass 163]163 Subclass 163 indent level is 1 Having bi-directional transducer
 [List of Pre Grant Publications for class 381 subclass 164][List of Patents for class 381 subclass 164]164 Subclass 164 indent level is 1 Thermal response to, or generation of, sound vibration
 [List of Pre Grant Publications for class 381 subclass 165][List of Patents for class 381 subclass 165]165 Subclass 165 indent level is 1 By modifying fluid flow
[List of Pre Grant Publications for class 381 subclass 166][List of Patents for class 381 subclass 166]166 Subclass 166 indent level is 1 Having a fluid as a conducting element
[List of Pre Grant Publications for class 381 subclass 355][List of Patents for class 381 subclass 355]355 Subclass 355 indent level is 1 Housed microphone
[List of Pre Grant Publications for class 381 subclass 369][List of Patents for class 381 subclass 369]369 Subclass 369 indent level is 1 Microphone capsule only
[List of Pre Grant Publications for class 381 subclass 182][List of Patents for class 381 subclass 182]182 Subclass 182 indent level is 1 Plural or compound reproducers
 [List of Pre Grant Publications for class 381 subclass 385][List of Patents for class 381 subclass 385]385 Subclass 385 indent level is 1 Having body supported structure other than on head
[List of Pre Grant Publications for class 381 subclass 386][List of Patents for class 381 subclass 386]386 Subclass 386 indent level is 1 Mounting or support feature of housed loudspeaker
 [List of Pre Grant Publications for class 381 subclass 189][List of Patents for class 381 subclass 189]189 Subclass 189 indent level is 1 Having protective or sheilding feature
 [List of Pre Grant Publications for class 381 subclass 190][List of Patents for class 381 subclass 190]190 Subclass 190 indent level is 1 Electrostrictive, magnetostrictive, or piezoelectric
 [List of Pre Grant Publications for class 381 subclass 191][List of Patents for class 381 subclass 191]191 Subclass 191 indent level is 1 Having electrostatic element (e.g., electret, vibrating plate)
[List of Pre Grant Publications for class 381 subclass 396][List of Patents for class 381 subclass 396]396 Subclass 396 indent level is 1 Electromagnetic (e.g., dyynamic)
 [List of Pre Grant Publications for class 381 subclass 124][List of Patents for class 381 subclass 124]124 MISCELLANEOUS
 
FOREIGN ART COLLECTIONS
 
      FOR000          CLASS-RELATED FOREIGN DOCUMENTS
Any foreign patents or non-patent literature from subclasses that have been reclassified have been transferred directly to FOR Collections listed below. These Collections contain ONLY foreign patents or non-patent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived.
  FOR100          AUDIO BANDWIDTH COMPRESSION OR EXPANSION (381/29)
      FOR101          Subclass FOR101 indent level is 1 With content reduction encoding (381/30)
      FOR102          Subclass FOR102 indent level is 1 Delay line (381/33)
  FOR103          TIME COMPRESSION OR EXPANSION (E.G., RUN LENGTH CODING) (381/34)
  FOR105          SPEECH ANALYSIS AND SYNTHESIS COMBINED (381/36)
  FOR106          Subclass FOR106 indent level is 1 Using frequency (381/37)
      FOR107          Subclass FOR107 indent level is 2 Pitch (381/38)
      FOR108          Subclass FOR108 indent level is 2 Formants (381/39)
      FOR109          Subclass FOR109 indent level is 1 Using time (381/40)
  FOR110          SPEECH ANALYSIS (E.G., PHONEME RECOGNITION) (381/41)
      FOR111          Subclass FOR111 indent level is 1 Voice recognition (381/42)
  FOR112          Subclass FOR112 indent level is 1 Word recognition (381/43)
      FOR113          Subclass FOR113 indent level is 2 Phonetic typewriters (381/44)
      FOR114          Subclass FOR114 indent level is 2 Frequency domain (381/45)
      FOR115          Subclass FOR115 indent level is 1 Detection of speech in noise (381/46)
      FOR116          Subclass FOR116 indent level is 1 Signal to noise ratio enhancement (381/47)
      FOR117          Subclass FOR117 indent level is 1 Speech parameter display (381/48)
      FOR118          Subclass FOR118 indent level is 1 Speech pitch fundamental frequency (381/49)
      FOR119          Subclass FOR119 indent level is 1 Speech formant frequencies (381/50)
  FOR120          SPEECH SYNTHESIS (381/51)
      FOR121          Subclass FOR121 indent level is 1 Speech from printed matter (381/52)
      FOR122          Subclass FOR122 indent level is 1 Vocal tract model (381/53)
      FOR123          ACOUSTICAL NOISE OR SOUND CANCELLATION (381/71)
      FOR124          NOISE SUPPRESSION (381/94)
     BINAURAL AND STEREOPHONIC
  FOR125          Subclass FOR125 indent level is 1 Speaker arrangement (381/24)
      FOR126          Subclass FOR126 indent level is 2 Earphone (381/25)
  FOR127          HEARING AIDS, ELECTRICAL (381/68)
      FOR128          Subclass FOR128 indent level is 1 Directional (381/68.1)
      FOR129          Subclass FOR129 indent level is 1 Frequency control (381/68.2)
      FOR130          Subclass FOR130 indent level is 1 Bone conduction (381/68.4)
      FOR131          Subclass FOR131 indent level is 1 Gain Control (381/68.3)
      FOR132          Subclass FOR132 indent level is 1 Spectacle (381/68.5)
      FOR133          Subclass FOR133 indent level is 1 Ear insert (381/68.6)
      FOR134          Subclass FOR134 indent level is 1 Hook over ear (381/68.7)
  FOR135          Subclass FOR135 indent level is 1 Specified casing or housing (381/69)
      FOR136          Subclass FOR136 indent level is 2 Having vacuum tube amplifier (381/69.1)
      FOR137          Subclass FOR137 indent level is 2 Having battery (381/69.2)
  FOR138          Subclass FOR138 indent level is 1 Having enclosure or housing (381/138)
  FOR140          Subclass FOR140 indent level is 1 With acoustic wave modifying structure (381/153)
  FOR147          Subclass FOR147 indent level is 1 Microphone (381/168)
      FOR148          Subclass FOR148 indent level is 2 With mounting or support feature (381/169)
      FOR149          Subclass FOR149 indent level is 2 Headphone (381/183)
      FOR150          Subclass FOR150 indent level is 1 Having body supported structure (e.g., earphone) (381/187)
      FOR151          Subclass FOR151 indent level is 1 With mounting or support feature (381/188)
  FOR152          Subclass FOR152 indent level is 1 Electromagnetic (e.g., dynamic) (381/192)
      FOR153          Subclass FOR153 indent level is 2 Having feature of edge-supported diaphragm (381/193)
  FOR154          Subclass FOR154 indent level is 2 Movable voice coil (381/194)
      FOR155          Subclass FOR155 indent level is 3 Multiple (e.g., double) (381/195)
      FOR156          Subclass FOR156 indent level is 3 Pattern (381/196)
      FOR157          Subclass FOR157 indent level is 3 Centering (381/197)
      FOR158          Subclass FOR158 indent level is 2 Including adjustment mechanism (381/198)
  FOR159          Subclass FOR159 indent level is 2 Magnetic circuit or core structure (381/199)
  FOR162          Subclass FOR162 indent level is 2 Specified diaphragm shape or structure (381/202)
      FOR163          Subclass FOR163 indent level is 3 Flat (381/203)
      FOR164          Subclass FOR164 indent level is 3 Conical (381/204)
      FOR165          Subclass FOR165 indent level is 1 Electro-acoustical transducer mounting or support (381/205)