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Classification Resources
 
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 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 123][List of Patents for class 181 subclass 123]123 ECHO SYSTEM
 [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 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 148][List of Patents for class 181 subclass 148]148 DIAPHRAGM AND ENCLOSURE
[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 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 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 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 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 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 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 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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