| Class 181 | ACOUSTICS |
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![[List of Pre Grant Publications for class 181 subclass .5]](../as.gif) | ![[List of Patents for class 181 subclass .5]](../ps.gif) | .5 | MISCELLANEOUS |
| SPEAKING TUBES |
| | 30 | AUDITORIUM |
| | 101 | GEOPHYSICAL OR SUBSURFACE EXPLORATION |
| | 102 |  Well logging |
| | 103 |  Programmed or timer-controlled |
| | 104 | Directional source or detector |
| | 105 | Bore hole or casing condition |
| | 106 | Seismic wave generation |
| | 107 | Programmed or timer-controlled |
| | 108 | Seismic source and detector |
| | 113 | Seismic wave generation |
| | 114 | Vehicle-mounted |
| | 115 | Bubble suppression or control |
| | 116 | Explosive |
| | 119 | Fluid means |
| | 121 | Moving weight |
| | 122 | Seismic wave detection |
| | 123 | ECHO SYSTEM |
| | 125 | SOUND LOCATION |
| | 126 | ANATOMIC OR PROSTHETIC RELATION |
| | 138 | MECHANICAL TELEPHONE |
| | 139 | WAVE GENERATION AND DETECTION |
| | 140 | WITH VESSEL |
| | 141 | COMBINED |
| | 142 | WAVE GENERATION |
| | 143 | MOVING SOUND PRODUCER OR DEFLECTOR |
| | 144 | PLURAL DIAPHRAGM SOUND SOURCES |
| | 148 | DIAPHRAGM AND ENCLOSURE |
| | 149 | Moisture proof |
| | 150 | Recessed (e.g., wall-mounted, etc.) |
| | 151 | With sound-absorbing means |
| | 152 | With horn |
| | 153 | Rounded enclosure (e.g., curved, etc.) |
| | 154 | Inclined diaphragm |
| | 155 | Reflector baffle |
| | 156 | Reflex baffle |
| | 157 | DIAPHRAGM |
| | 158 | Microphone type |
| | 159 | With horn |
| | 160 | With resonant chamber |
| | 161 | With direct mechanical connection to drive unit |
| | 163 | Plural dependent diaphragms |
| | 164 | Sectional diaphragm |
| | 166 | With damping means |
| | 167 | Critically defined material or coating |
| | 171 | Mounting or suspension means |
| | 173 | Particular shape |
| | 175 | SOUND-MODIFYING MEANS |
| | 176 | Lens |
| | 177 | Intensifying horn |
| | 178 | Collapsible |
| | 179 | With particular mounting structure |
| | 180 | Material |
| | 181 | With vibratory filaments |
| | 182 | With resonant chamber |
| | 184 | Having apertures in walls |
| | 185 | With sound-path restriction |
| | 187 | Plural intensifying portions |
| | 189 | Multisection housing |
| | 191 | With external sound deflector |
| | 192 | Particular shape of the horn |
| | 196 | Within tubular means |
| | 198 | Housing or enclosure (e.g., sound confining and absorbing) |
| | 206 | By wave interference |
| | 207 | Mechanical vibration attenuator |
| | 210 | Sound absorbing fence or screen (e.g., jet engine or vehicle noise) |
| | 211 | Combined |
| | 212 | Muffler, fluid conducting type |
| | 213 | Reaction engine type |
| | 214 |  Upstream (e.g., intake silencer) |
| | 215 | With adjustable outlet nozzle |
| | 217 | Removable silencer unit (e.g., mobile) |
| | 218 | Ground installation silencer |
| | 219 | With adjustable internal baffles |
| | 220 | With disparate fluid mingling |
| | 222 | With sound absorbing material |
| | 223 | Silencer for firearms |
| | 224 | Sound absorbing ventilating duct or curb (e.g., a/c, heat, air flow type) |
| | 225 | With fan to assist fluid flow |
| | 226 | With adjustable fluid flow |
| | 227 | Pipe-muffler (e.g., tail pipe type) |
| | 228 | With exhaust pipe |
| | 229 | Carburetor, burner, or compressor intake silencer |
| | 230 | Pneumatic type motor (e.g., air hammer, etc.) |
| | 231 | With solid particle separator (e.g., spark arrestor, vacuum cleaner, etc.) |
| | 232 | Separate distinct units serially connected |
| | 233 | Liquid motion silencer |
| | 235 | Underwater discharge |
| | 236 | With muffler cut-out |
| | 237 | With pressure relief safety valve |
| | 238 | Multiple distinct inlets and/or outlets |
| | 240 | Manifold type |
| | 241 | Adjustable muffler (i.e., internal or external parts) |
| | 242 | Mouthpiece (e.g., telephone, microphone, etc.) |
| | 243 | With repair, replacement, or quick disassembly |
| | 244 | Corrosion prevention |
| | 247 | Straight-through passage |
| | 248 | Continuous conduit |
| | 252 | With sound absorbing material |
| | 253 | With muffler bypass |
| | 255 | Expansion chamber |
| | 256 | With sound absorbing material |
| | 259 | With disparate fluid mingling |
| | 264 | With baffle or baffle structure |
| | 265 | Retroverted |
| | 267 | Coaxial foraminous walls |
| | 268 | Multi-passage |
| | 269 | Expansion chamber type |
| | 270 |  With alternating partial baffles along the length of casing |
| | 271 | With adjustable or flexible wall |
| | 272 | Plural chambers |
| | 273 | And side branch chamber |
| | 274 | With centrifugal flow |
| | 275 | And multi-passage |
| | 276 | Side branch |
| | 277 | Movable baffle |
| | 279 | Spiral |
| | 281 | Perpendicular and/or oblique |
| | 282 | Casings |
| | 284 | Sound absorbing panels |
| | 285 | Load bearing block type structure |
| | 286 | Specific acoustical properties or dimensions |
| | 287 | Movable/foldable panels |
| | 288 | Cellular |
| | 289 | Light permeable |
| | 290 | Multilayer panel or wall structure |
| | 293 | With channels or cavities in surface layer |
| | 294 | Materials |
| | 295 | Space absorbers |
| | 296 | Methods |
| CROSS-REFERENCE ART COLLECTIONS | ||
| | 400 | WAVE COUPLING |
| | 403 | REFRIGERATOR COMPRESSSOR MUFFLER |
| | 404 | HOBBY CRAFT ENGINE MUFFLER |
| FOREIGN ART COLLECTIONS | ||
| FOR000 | CLASS-RELATED FOREIGN DOCUMENTS |