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Class   181ACOUSTICS
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 [List of Pre Grant Publications for class 181 subclass .5][List of Patents for class 181 subclass .5].5 MISCELLANEOUS
     SPEAKING TUBES
 [List of Pre Grant Publications for class 181 subclass 18][List of Patents for class 181 subclass 18]18 Subclass 18 indent level is 1 Systems
 [List of Pre Grant Publications for class 181 subclass 19][List of Patents for class 181 subclass 19]19 Subclass 19 indent level is 1 Alarms and indicators
 [List of Pre Grant Publications for class 181 subclass 20][List of Patents for class 181 subclass 20]20 Subclass 20 indent level is 1 Combined mouth and ear pieces
 [List of Pre Grant Publications for class 181 subclass 21][List of Patents for class 181 subclass 21]21 Subclass 21 indent level is 1 Mouthpieces
 [List of Pre Grant Publications for class 181 subclass 22][List of Patents for class 181 subclass 22]22 Subclass 22 indent level is 1 Tubes
 [List of Pre Grant Publications for class 181 subclass 30][List of Patents for class 181 subclass 30]30 AUDITORIUM
[List of Pre Grant Publications for class 181 subclass 101][List of Patents for class 181 subclass 101]101 GEOPHYSICAL OR SUBSURFACE EXPLORATION
[List of Pre Grant Publications for class 181 subclass 102][List of Patents for class 181 subclass 102]102 Subclass 102 indent level is 1 Well logging
 [List of Pre Grant Publications for class 181 subclass 103][List of Patents for class 181 subclass 103]103 Subclass 103 indent level is 2 Programmed or timer-controlled
 [List of Pre Grant Publications for class 181 subclass 104][List of Patents for class 181 subclass 104]104 Subclass 104 indent level is 2 Directional source or detector
 [List of Pre Grant Publications for class 181 subclass 105][List of Patents for class 181 subclass 105]105 Subclass 105 indent level is 2 Bore hole or casing condition
 [List of Pre Grant Publications for class 181 subclass 106][List of Patents for class 181 subclass 106]106 Subclass 106 indent level is 2 Seismic wave generation
 [List of Pre Grant Publications for class 181 subclass 107][List of Patents for class 181 subclass 107]107 Subclass 107 indent level is 1 Programmed or timer-controlled
[List of Pre Grant Publications for class 181 subclass 108][List of Patents for class 181 subclass 108]108 Subclass 108 indent level is 1 Seismic source and detector
 [List of Pre Grant Publications for class 181 subclass 109][List of Patents for class 181 subclass 109]109 Subclass 109 indent level is 2 Aerial
 [List of Pre Grant Publications for class 181 subclass 110][List of Patents for class 181 subclass 110]110 Subclass 110 indent level is 2 Underwater
 [List of Pre Grant Publications for class 181 subclass 111][List of Patents for class 181 subclass 111]111 Subclass 111 indent level is 2 Plural sources
 [List of Pre Grant Publications for class 181 subclass 112][List of Patents for class 181 subclass 112]112 Subclass 112 indent level is 2 Plural detectors
[List of Pre Grant Publications for class 181 subclass 113][List of Patents for class 181 subclass 113]113 Subclass 113 indent level is 1 Seismic wave generation
 [List of Pre Grant Publications for class 181 subclass 114][List of Patents for class 181 subclass 114]114 Subclass 114 indent level is 2 Vehicle-mounted
 [List of Pre Grant Publications for class 181 subclass 115][List of Patents for class 181 subclass 115]115 Subclass 115 indent level is 2 Bubble suppression or control
[List of Pre Grant Publications for class 181 subclass 116][List of Patents for class 181 subclass 116]116 Subclass 116 indent level is 2 Explosive
[List of Pre Grant Publications for class 181 subclass 119][List of Patents for class 181 subclass 119]119 Subclass 119 indent level is 2 Fluid means
 [List of Pre Grant Publications for class 181 subclass 121][List of Patents for class 181 subclass 121]121 Subclass 121 indent level is 2 Moving weight
 [List of Pre Grant Publications for class 181 subclass 122][List of Patents for class 181 subclass 122]122 Subclass 122 indent level is 1 Seismic wave detection
[List of Pre Grant Publications for class 181 subclass 123][List of Patents for class 181 subclass 123]123 ECHO SYSTEM
 [List of Pre Grant Publications for class 181 subclass 124][List of Patents for class 181 subclass 124]124 Subclass 124 indent level is 1 Altitude or depth detection
 [List of Pre Grant Publications for class 181 subclass 125][List of Patents for class 181 subclass 125]125 SOUND LOCATION
[List of Pre Grant Publications for class 181 subclass 126][List of Patents for class 181 subclass 126]126 ANATOMIC OR PROSTHETIC RELATION
 [List of Pre Grant Publications for class 181 subclass 127][List of Patents for class 181 subclass 127]127 Subclass 127 indent level is 1 Dentiphone
[List of Pre Grant Publications for class 181 subclass 128][List of Patents for class 181 subclass 128]128 Subclass 128 indent level is 1 Ear and mouth
 [List of Pre Grant Publications for class 181 subclass 129][List of Patents for class 181 subclass 129]129 Subclass 129 indent level is 2 Ear
[List of Pre Grant Publications for class 181 subclass 130][List of Patents for class 181 subclass 130]130 Subclass 130 indent level is 2 Auditory canal insert
 [List of Pre Grant Publications for class 181 subclass 136][List of Patents for class 181 subclass 136]136 Subclass 136 indent level is 2 Deflector type
 [List of Pre Grant Publications for class 181 subclass 137][List of Patents for class 181 subclass 137]137 Subclass 137 indent level is 2 Receiver
 [List of Pre Grant Publications for class 181 subclass 138][List of Patents for class 181 subclass 138]138 MECHANICAL TELEPHONE
 [List of Pre Grant Publications for class 181 subclass 139][List of Patents for class 181 subclass 139]139 WAVE GENERATION AND DETECTION
 [List of Pre Grant Publications for class 181 subclass 140][List of Patents for class 181 subclass 140]140 WITH VESSEL
 [List of Pre Grant Publications for class 181 subclass 141][List of Patents for class 181 subclass 141]141 COMBINED
 [List of Pre Grant Publications for class 181 subclass 142][List of Patents for class 181 subclass 142]142 WAVE GENERATION
 [List of Pre Grant Publications for class 181 subclass 143][List of Patents for class 181 subclass 143]143 MOVING SOUND PRODUCER OR DEFLECTOR
[List of Pre Grant Publications for class 181 subclass 144][List of Patents for class 181 subclass 144]144 PLURAL DIAPHRAGM SOUND SOURCES
 [List of Pre Grant Publications for class 181 subclass 145][List of Patents for class 181 subclass 145]145 Subclass 145 indent level is 1 Plural chambers
 [List of Pre Grant Publications for class 181 subclass 146][List of Patents for class 181 subclass 146]146 Subclass 146 indent level is 1 With sound-asborbing means
 [List of Pre Grant Publications for class 181 subclass 147][List of Patents for class 181 subclass 147]147 Subclass 147 indent level is 1 Three diaphragms
[List of Pre Grant Publications for class 181 subclass 148][List of Patents for class 181 subclass 148]148 DIAPHRAGM AND ENCLOSURE
 [List of Pre Grant Publications for class 181 subclass 149][List of Patents for class 181 subclass 149]149 Subclass 149 indent level is 1 Moisture proof
 [List of Pre Grant Publications for class 181 subclass 150][List of Patents for class 181 subclass 150]150 Subclass 150 indent level is 1 Recessed (e.g., wall-mounted, etc.)
 [List of Pre Grant Publications for class 181 subclass 151][List of Patents for class 181 subclass 151]151 Subclass 151 indent level is 1 With sound-absorbing means
 [List of Pre Grant Publications for class 181 subclass 152][List of Patents for class 181 subclass 152]152 Subclass 152 indent level is 1 With horn
 [List of Pre Grant Publications for class 181 subclass 153][List of Patents for class 181 subclass 153]153 Subclass 153 indent level is 1 Rounded enclosure (e.g., curved, etc.)
 [List of Pre Grant Publications for class 181 subclass 154][List of Patents for class 181 subclass 154]154 Subclass 154 indent level is 1 Inclined diaphragm
 [List of Pre Grant Publications for class 181 subclass 155][List of Patents for class 181 subclass 155]155 Subclass 155 indent level is 1 Reflector baffle
 [List of Pre Grant Publications for class 181 subclass 156][List of Patents for class 181 subclass 156]156 Subclass 156 indent level is 1 Reflex baffle
[List of Pre Grant Publications for class 181 subclass 157][List of Patents for class 181 subclass 157]157 DIAPHRAGM
 [List of Pre Grant Publications for class 181 subclass 158][List of Patents for class 181 subclass 158]158 Subclass 158 indent level is 1 Microphone type
 [List of Pre Grant Publications for class 181 subclass 159][List of Patents for class 181 subclass 159]159 Subclass 159 indent level is 1 With horn
 [List of Pre Grant Publications for class 181 subclass 160][List of Patents for class 181 subclass 160]160 Subclass 160 indent level is 1 With resonant chamber
[List of Pre Grant Publications for class 181 subclass 161][List of Patents for class 181 subclass 161]161 Subclass 161 indent level is 1 With direct mechanical connection to drive unit
 [List of Pre Grant Publications for class 181 subclass 162][List of Patents for class 181 subclass 162]162 Subclass 162 indent level is 2 Stylus bar
 [List of Pre Grant Publications for class 181 subclass 163][List of Patents for class 181 subclass 163]163 Subclass 163 indent level is 1 Plural dependent diaphragms
[List of Pre Grant Publications for class 181 subclass 164][List of Patents for class 181 subclass 164]164 Subclass 164 indent level is 1 Sectional diaphragm
 [List of Pre Grant Publications for class 181 subclass 165][List of Patents for class 181 subclass 165]165 Subclass 165 indent level is 2 Concentric annular section
 [List of Pre Grant Publications for class 181 subclass 166][List of Patents for class 181 subclass 166]166 Subclass 166 indent level is 1 With damping means
[List of Pre Grant Publications for class 181 subclass 167][List of Patents for class 181 subclass 167]167 Subclass 167 indent level is 1 Critically defined material or coating
 [List of Pre Grant Publications for class 181 subclass 168][List of Patents for class 181 subclass 168]168 Subclass 168 indent level is 2 Metallic material
 [List of Pre Grant Publications for class 181 subclass 169][List of Patents for class 181 subclass 169]169 Subclass 169 indent level is 2 Fibrous material
 [List of Pre Grant Publications for class 181 subclass 170][List of Patents for class 181 subclass 170]170 Subclass 170 indent level is 2 Laminated type
[List of Pre Grant Publications for class 181 subclass 171][List of Patents for class 181 subclass 171]171 Subclass 171 indent level is 1 Mounting or suspension means
 [List of Pre Grant Publications for class 181 subclass 172][List of Patents for class 181 subclass 172]172 Subclass 172 indent level is 2 Elastic suspension means
[List of Pre Grant Publications for class 181 subclass 173][List of Patents for class 181 subclass 173]173 Subclass 173 indent level is 1 Particular shape
 [List of Pre Grant Publications for class 181 subclass 174][List of Patents for class 181 subclass 174]174 Subclass 174 indent level is 2 Variable thickness
[List of Pre Grant Publications for class 181 subclass 175][List of Patents for class 181 subclass 175]175 SOUND-MODIFYING MEANS
 [List of Pre Grant Publications for class 181 subclass 176][List of Patents for class 181 subclass 176]176 Subclass 176 indent level is 1 Lens
[List of Pre Grant Publications for class 181 subclass 177][List of Patents for class 181 subclass 177]177 Subclass 177 indent level is 1 Intensifying horn
 [List of Pre Grant Publications for class 181 subclass 178][List of Patents for class 181 subclass 178]178 Subclass 178 indent level is 2 Collapsible
 [List of Pre Grant Publications for class 181 subclass 179][List of Patents for class 181 subclass 179]179 Subclass 179 indent level is 2 With particular mounting structure
 [List of Pre Grant Publications for class 181 subclass 180][List of Patents for class 181 subclass 180]180 Subclass 180 indent level is 2 Material
 [List of Pre Grant Publications for class 181 subclass 181][List of Patents for class 181 subclass 181]181 Subclass 181 indent level is 2 With vibratory filaments
[List of Pre Grant Publications for class 181 subclass 182][List of Patents for class 181 subclass 182]182 Subclass 182 indent level is 2 With resonant chamber
 [List of Pre Grant Publications for class 181 subclass 184][List of Patents for class 181 subclass 184]184 Subclass 184 indent level is 2 Having apertures in walls
[List of Pre Grant Publications for class 181 subclass 185][List of Patents for class 181 subclass 185]185 Subclass 185 indent level is 2 With sound-path restriction
[List of Pre Grant Publications for class 181 subclass 187][List of Patents for class 181 subclass 187]187 Subclass 187 indent level is 2 Plural intensifying portions
[List of Pre Grant Publications for class 181 subclass 189][List of Patents for class 181 subclass 189]189 Subclass 189 indent level is 2 Multisection housing
 [List of Pre Grant Publications for class 181 subclass 191][List of Patents for class 181 subclass 191]191 Subclass 191 indent level is 2 With external sound deflector
[List of Pre Grant Publications for class 181 subclass 192][List of Patents for class 181 subclass 192]192 Subclass 192 indent level is 2 Particular shape of the horn
[List of Pre Grant Publications for class 181 subclass 196][List of Patents for class 181 subclass 196]196 Subclass 196 indent level is 1 Within tubular means
 [List of Pre Grant Publications for class 181 subclass 197][List of Patents for class 181 subclass 197]197 Subclass 197 indent level is 2 Adjustable
[List of Pre Grant Publications for class 181 subclass 198][List of Patents for class 181 subclass 198]198 Subclass 198 indent level is 1 Housing or enclosure (e.g., sound confining and absorbing)
 [List of Pre Grant Publications for class 181 subclass 199][List of Patents for class 181 subclass 199]199 Subclass 199 indent level is 2 Speaker type
[List of Pre Grant Publications for class 181 subclass 200][List of Patents for class 181 subclass 200]200 Subclass 200 indent level is 2 Machine type enclosure
 [List of Pre Grant Publications for class 181 subclass 206][List of Patents for class 181 subclass 206]206 Subclass 206 indent level is 1 By wave interference
[List of Pre Grant Publications for class 181 subclass 207][List of Patents for class 181 subclass 207]207 Subclass 207 indent level is 1 Mechanical vibration attenuator
 [List of Pre Grant Publications for class 181 subclass 208][List of Patents for class 181 subclass 208]208 Subclass 208 indent level is 2 Damping of flexural structure
 [List of Pre Grant Publications for class 181 subclass 209][List of Patents for class 181 subclass 209]209 Subclass 209 indent level is 2 Relatively moving parts
 [List of Pre Grant Publications for class 181 subclass 210][List of Patents for class 181 subclass 210]210 Subclass 210 indent level is 1 Sound absorbing fence or screen (e.g., jet engine or vehicle noise)
 [List of Pre Grant Publications for class 181 subclass 211][List of Patents for class 181 subclass 211]211 Subclass 211 indent level is 1 Combined
[List of Pre Grant Publications for class 181 subclass 212][List of Patents for class 181 subclass 212]212 Subclass 212 indent level is 1 Muffler, fluid conducting type
[List of Pre Grant Publications for class 181 subclass 213][List of Patents for class 181 subclass 213]213 Subclass 213 indent level is 2 Reaction engine type
 [List of Pre Grant Publications for class 181 subclass 223][List of Patents for class 181 subclass 223]223 Subclass 223 indent level is 2 Silencer for firearms
 [List of Pre Grant Publications for class 181 subclass 224][List of Patents for class 181 subclass 224]224 Subclass 224 indent level is 2 Sound absorbing ventilating duct or curb (e.g., a/c, heat, air flow type)
 [List of Pre Grant Publications for class 181 subclass 225][List of Patents for class 181 subclass 225]225 Subclass 225 indent level is 2 With fan to assist fluid flow
 [List of Pre Grant Publications for class 181 subclass 226][List of Patents for class 181 subclass 226]226 Subclass 226 indent level is 2 With adjustable fluid flow
 [List of Pre Grant Publications for class 181 subclass 227][List of Patents for class 181 subclass 227]227 Subclass 227 indent level is 2 Pipe-muffler (e.g., tail pipe type)
 [List of Pre Grant Publications for class 181 subclass 228][List of Patents for class 181 subclass 228]228 Subclass 228 indent level is 2 With exhaust pipe
 [List of Pre Grant Publications for class 181 subclass 229][List of Patents for class 181 subclass 229]229 Subclass 229 indent level is 2 Carburetor, burner, or compressor intake silencer
 [List of Pre Grant Publications for class 181 subclass 230][List of Patents for class 181 subclass 230]230 Subclass 230 indent level is 2 Pneumatic type motor (e.g., air hammer, etc.)
 [List of Pre Grant Publications for class 181 subclass 231][List of Patents for class 181 subclass 231]231 Subclass 231 indent level is 2 With solid particle separator (e.g., spark arrestor, vacuum cleaner, etc.)
 [List of Pre Grant Publications for class 181 subclass 232][List of Patents for class 181 subclass 232]232 Subclass 232 indent level is 2 Separate distinct units serially connected
[List of Pre Grant Publications for class 181 subclass 233][List of Patents for class 181 subclass 233]233 Subclass 233 indent level is 2 Liquid motion silencer
 [List of Pre Grant Publications for class 181 subclass 235][List of Patents for class 181 subclass 235]235 Subclass 235 indent level is 2 Underwater discharge
 [List of Pre Grant Publications for class 181 subclass 236][List of Patents for class 181 subclass 236]236 Subclass 236 indent level is 2 With muffler cut-out
 [List of Pre Grant Publications for class 181 subclass 237][List of Patents for class 181 subclass 237]237 Subclass 237 indent level is 2 With pressure relief safety valve
[List of Pre Grant Publications for class 181 subclass 238][List of Patents for class 181 subclass 238]238 Subclass 238 indent level is 2 Multiple distinct inlets and/or outlets
 [List of Pre Grant Publications for class 181 subclass 240][List of Patents for class 181 subclass 240]240 Subclass 240 indent level is 2 Manifold type
 [List of Pre Grant Publications for class 181 subclass 241][List of Patents for class 181 subclass 241]241 Subclass 241 indent level is 2 Adjustable muffler (i.e., internal or external parts)
 [List of Pre Grant Publications for class 181 subclass 242][List of Patents for class 181 subclass 242]242 Subclass 242 indent level is 2 Mouthpiece (e.g., telephone, microphone, etc.)
 [List of Pre Grant Publications for class 181 subclass 243][List of Patents for class 181 subclass 243]243 Subclass 243 indent level is 2 With repair, replacement, or quick disassembly
[List of Pre Grant Publications for class 181 subclass 244][List of Patents for class 181 subclass 244]244 Subclass 244 indent level is 2 Corrosion prevention
[List of Pre Grant Publications for class 181 subclass 247][List of Patents for class 181 subclass 247]247 Subclass 247 indent level is 2 Straight-through passage
[List of Pre Grant Publications for class 181 subclass 256][List of Patents for class 181 subclass 256]256 Subclass 256 indent level is 2 With sound absorbing material
[List of Pre Grant Publications for class 181 subclass 259][List of Patents for class 181 subclass 259]259 Subclass 259 indent level is 2 With disparate fluid mingling
[List of Pre Grant Publications for class 181 subclass 264][List of Patents for class 181 subclass 264]264 Subclass 264 indent level is 2 With baffle or baffle structure
[List of Pre Grant Publications for class 181 subclass 284][List of Patents for class 181 subclass 284]284 Subclass 284 indent level is 1 Sound absorbing panels
 [List of Pre Grant Publications for class 181 subclass 285][List of Patents for class 181 subclass 285]285 Subclass 285 indent level is 2 Load bearing block type structure
 [List of Pre Grant Publications for class 181 subclass 286][List of Patents for class 181 subclass 286]286 Subclass 286 indent level is 2 Specific acoustical properties or dimensions
 [List of Pre Grant Publications for class 181 subclass 287][List of Patents for class 181 subclass 287]287 Subclass 287 indent level is 2 Movable/foldable panels
 [List of Pre Grant Publications for class 181 subclass 288][List of Patents for class 181 subclass 288]288 Subclass 288 indent level is 2 Cellular
 [List of Pre Grant Publications for class 181 subclass 289][List of Patents for class 181 subclass 289]289 Subclass 289 indent level is 2 Light permeable
[List of Pre Grant Publications for class 181 subclass 290][List of Patents for class 181 subclass 290]290 Subclass 290 indent level is 2 Multilayer panel or wall structure
 [List of Pre Grant Publications for class 181 subclass 293][List of Patents for class 181 subclass 293]293 Subclass 293 indent level is 2 With channels or cavities in surface layer
 [List of Pre Grant Publications for class 181 subclass 294][List of Patents for class 181 subclass 294]294 Subclass 294 indent level is 2 Materials
 [List of Pre Grant Publications for class 181 subclass 295][List of Patents for class 181 subclass 295]295 Subclass 295 indent level is 1 Space absorbers
 [List of Pre Grant Publications for class 181 subclass 296][List of Patents for class 181 subclass 296]296 Subclass 296 indent level is 1 Methods
 
CROSS-REFERENCE ART COLLECTIONS
 
[List of Pre Grant Publications for class 181 subclass 400][List of Patents for class 181 subclass 400]400 WAVE COUPLING
 [List of Pre Grant Publications for class 181 subclass 401][List of Patents for class 181 subclass 401]401 Subclass 401 indent level is 1 Earth
 [List of Pre Grant Publications for class 181 subclass 402][List of Patents for class 181 subclass 402]402 Subclass 402 indent level is 1 Liquid
 [List of Pre Grant Publications for class 181 subclass 403][List of Patents for class 181 subclass 403]403 REFRIGERATOR COMPRESSSOR MUFFLER
 [List of Pre Grant Publications for class 181 subclass 404][List of Patents for class 181 subclass 404]404 HOBBY CRAFT ENGINE MUFFLER
 
FOREIGN ART COLLECTIONS
 
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