Subclasses list

• .5 MISCELLANEOUS 
  Patents: 91
  Patent Applications: 6
• 18 Systems 
  Patents: 11
  Patent Applications: 1
• 19 Alarms and indicators 
  Patents: 4
  Patent Applications: 0
• 20 Combined mouth and ear pieces 
  Patents: 13
  Patent Applications: 0
• 21 Mouthpieces 
  Patents: 15
  Patent Applications: 1
• 22 Tubes 
  Patents: 16
  Patent Applications: 0
• 30 AUDITORIUM 
  Patents: 61
  Patent Applications: 2
• 101 GEOPHYSICAL OR SUBSURFACE EXPLORATION 
  Patents: 40
  Patent Applications: 3
• 102 Well logging 
  Patents: 270
  Patent Applications: 7
• 103 Programmed or timer-controlled 
  Patents: 43
  Patent Applications: 1
• 104 Directional source or detector 
  Patents: 109
  Patent Applications: 2
• 105 Bore hole or casing condition 
  Patents: 171
  Patent Applications: 2
• 106 Seismic wave generation 
  Patents: 271
  Patent Applications: 14
• 107 Programmed or timer-controlled 
  Patents: 42
  Patent Applications: 1
• 108 Seismic source and detector 
  Patents: 113
  Patent Applications: 10
• 109 Aerial 
  Patents: 4
  Patent Applications: 0
• 110 Underwater 
  Patents: 145
  Patent Applications: 4
• 111 Plural sources 
  Patents: 76
  Patent Applications: 6
• 112 Plural detectors 
  Patents: 133
  Patent Applications: 6
• 113 Seismic wave generation 
  Patents: 155
  Patent Applications: 6
• 114 Vehicle-mounted 
  Patents: 140
  Patent Applications: 1
• 115 Bubble suppression or control 
  Patents: 55
  Patent Applications: 0
• 116 Explosive 
  Patents: 79
  Patent Applications: 1
• 117 Gas 
  Patents: 40
  Patent Applications: 0
• 118 Underwater 
  Patents: 85
  Patent Applications: 0
• 119 Fluid means 
  Patents: 122
  Patent Applications: 2
• 120 Underwater 
  Patents: 227
  Patent Applications: 1
• 121 Moving weight 
  Patents: 173
  Patent Applications: 16
• 122 Seismic wave detection 
  Patents: 149
  Patent Applications: 9
• 123 ECHO SYSTEM 
  Patents: 10
  Patent Applications: 3
• 124 Altitude or depth detection 
  Patents: 41
  Patent Applications: 1
• 125 SOUND LOCATION 
  Patents: 9
  Patent Applications: 1
• 126 ANATOMIC OR PROSTHETIC RELATION 
  Patents: 22
  Patent Applications: 4
• 127 Dentiphone 
  Patents: 6
  Patent Applications: 0
• 128 Ear and mouth 
  Patents: 21
  Patent Applications: 0
• 129 Ear 
  Patents: 219
  Patent Applications: 16
• 130 Auditory canal insert 
  Patents: 184
  Patent Applications: 26
• 131 Stethoscope 
  Patents: 209
  Patent Applications: 33
• 132 With diaphragm 
  Patents: 17
  Patent Applications: 1
• 133 Deflector type 
  Patents: 7
  Patent Applications: 0
• 134 Eardrum 
  Patents: 9
  Patent Applications: 0
• 135 Ear insert 
  Patents: 257
  Patent Applications: 38
• 136 Deflector type 
  Patents: 25
  Patent Applications: 1
• 137 Receiver 
  Patents: 78
  Patent Applications: 0
• 138 MECHANICAL TELEPHONE 
  Patents: 6
  Patent Applications: 0
• 139 WAVE GENERATION AND DETECTION 
  Patents: 22
  Patent Applications: 11
• 140 WITH VESSEL 
  Patents: 16
  Patent Applications: 2
• 141 COMBINED 
  Patents: 167
  Patent Applications: 19
• 142 WAVE GENERATION 
  Patents: 72
  Patent Applications: 14
• 143 MOVING SOUND PRODUCER OR DEFLECTOR 
  Patents: 15
  Patent Applications: 0
• 144 PLURAL DIAPHRAGM SOUND SOURCES 
  Patents: 258
  Patent Applications: 4
• 145 Plural chambers 
  Patents: 153
  Patent Applications: 4
• 146 With sound-asborbing means 
  Patents: 79
  Patent Applications: 0
• 147 Three diaphragms 
  Patents: 84
  Patent Applications: 0
• 148 DIAPHRAGM AND ENCLOSURE 
  Patents: 197
  Patent Applications: 42
• 149 Moisture proof 
  Patents: 49
  Patent Applications: 5
• 150 Recessed (e.g., wall-mounted, etc.) 
  Patents: 237
  Patent Applications: 26
• 151 With sound-absorbing means 
  Patents: 147
  Patent Applications: 12
• 152 With horn 
  Patents: 195
  Patent Applications: 5
• 153 Rounded enclosure (e.g., curved, etc.) 
  Patents: 175
  Patent Applications: 11
• 154 Inclined diaphragm 
  Patents: 58
  Patent Applications: 2
• 155 Reflector baffle 
  Patents: 204
  Patent Applications: 8
• 156 Reflex baffle 
  Patents: 292
  Patent Applications: 21
• 157 DIAPHRAGM 
  Patents: 56
  Patent Applications: 8
• 158 Microphone type 
  Patents: 61
  Patent Applications: 2
• 159 With horn 
  Patents: 87
  Patent Applications: 1
• 160 With resonant chamber 
  Patents: 96
  Patent Applications: 5
• 161 With direct mechanical connection to drive unit 
  Patents: 44
  Patent Applications: 3
• 162 Stylus bar 
  Patents: 1
  Patent Applications: 0
• 163 Plural dependent diaphragms 
  Patents: 76
  Patent Applications: 3
• 164 Sectional diaphragm 
  Patents: 39
  Patent Applications: 0
• 165 Concentric annular section 
  Patents: 26
  Patent Applications: 1
• 166 With damping means 
  Patents: 88
  Patent Applications: 5
• 167 Critically defined material or coating 
  Patents: 109
  Patent Applications: 20
• 168 Metallic material 
  Patents: 33
  Patent Applications: 4
• 169 Fibrous material 
  Patents: 75
  Patent Applications: 11
• 170 Laminated type 
  Patents: 82
  Patent Applications: 3
• 171 Mounting or suspension means 
  Patents: 220
  Patent Applications: 13
• 172 Elastic suspension means 
  Patents: 133
  Patent Applications: 10
• 173 Particular shape 
  Patents: 117
  Patent Applications: 12
• 174 Variable thickness 
  Patents: 29
  Patent Applications: 2
• 175 SOUND-MODIFYING MEANS 
  Patents: 151
  Patent Applications: 17
• 176 Lens 
  Patents: 45
  Patent Applications: 6
• 177 Intensifying horn 
  Patents: 38
  Patent Applications: 3
• 178 Collapsible 
  Patents: 12
  Patent Applications: 2
• 179 With particular mounting structure 
  Patents: 31
  Patent Applications: 1
• 180 Material 
  Patents: 13
  Patent Applications: 1
• 181 With vibratory filaments 
  Patents: 4
  Patent Applications: 1
• 182 With resonant chamber 
  Patents: 40
  Patent Applications: 3
• 183 Double wall 
  Patents: 4
  Patent Applications: 0
• 184 Having apertures in walls 
  Patents: 28
  Patent Applications: 0
• 185 With sound-path restriction 
  Patents: 35
  Patent Applications: 4
• 186 Adjustable 
  Patents: 11
  Patent Applications: 1
• 187 Plural intensifying portions 
  Patents: 44
  Patent Applications: 2
• 188 Similar portions 
  Patents: 22
  Patent Applications: 0
• 189 Multisection housing 
  Patents: 22
  Patent Applications: 0
• 190 Separable 
  Patents: 17
  Patent Applications: 0
• 191 With external sound deflector 
  Patents: 33
  Patent Applications: 5
• 192 Particular shape of the horn 
  Patents: 63
  Patent Applications: 6
• 193 Spiral sound path 
  Patents: 7
  Patent Applications: 0
• 194 Doubly folded sound path 
  Patents: 17
  Patent Applications: 0
• 195 Wide angle annular outlet 
  Patents: 17
  Patent Applications: 0
• 196 Within tubular means 
  Patents: 33
  Patent Applications: 3
• 197 Adjustable 
  Patents: 6
  Patent Applications: 2
• 198 Housing or enclosure (e.g., sound confining and absorbing) 
  Patents: 119
  Patent Applications: 9
• 199 Speaker type 
  Patents: 514
  Patent Applications: 55
• 200 Machine type enclosure 
  Patents: 115
  Patent Applications: 20
• 201 Offfice type devices (e.g., typewriters, teleprinters, etc.) 
  Patents: 25
  Patent Applications: 1
• 202 Electical type devices (e.g., transformers, motors, etc.) 
  Patents: 114
  Patent Applications: 13
• 203 Reaction engine test chamber 
  Patents: 8
  Patent Applications: 0
• 204 Internal-combustion engine 
  Patents: 222
  Patent Applications: 30
• 205 Partial enclosure or shroud 
  Patents: 55
  Patent Applications: 8
• 206 By wave interference 
  Patents: 138
  Patent Applications: 24
• 207 Mechanical vibration attenuator 
  Patents: 233
  Patent Applications: 29
• 208 Damping of flexural structure 
  Patents: 147
  Patent Applications: 9
• 209 Relatively moving parts 
  Patents: 45
  Patent Applications: 8
• 210 Sound absorbing fence or screen (e.g., jet engine or vehicle noise) 
  Patents: 163
  Patent Applications: 38
• 211 Combined 
  Patents: 72
  Patent Applications: 10
• 212 Muffler, fluid conducting type 
  Patents: 66
  Patent Applications: 24
• 213 Reaction engine type 
  Patents: 167
  Patent Applications: 15
• 214 Upstream (e.g., intake silencer) 
  Patents: 88
  Patent Applications: 19
• 215 With adjustable outlet nozzle 
  Patents: 34
  Patent Applications: 2
• 216 Longitudinally adjustable section 
  Patents: 14
  Patent Applications: 2
• 217 Removable silencer unit (e.g., mobile) 
  Patents: 22
  Patent Applications: 2
• 218 Ground installation silencer 
  Patents: 27
  Patent Applications: 0
• 219 With adjustable internal baffles 
  Patents: 21
  Patent Applications: 4
• 220 With disparate fluid mingling 
  Patents: 96
  Patent Applications: 7
• 221 Liquid 
  Patents: 18
  Patent Applications: 0
• 222 With sound absorbing material 
  Patents: 95
  Patent Applications: 14
• 223 Silencer for firearms 
  Patents: 49
  Patent Applications: 3
• 224 Sound absorbing ventilating duct or curb (e.g., a/c, heat, air flow type) 
  Patents: 266
  Patent Applications: 32
• 225 With fan to assist fluid flow 
  Patents: 101
  Patent Applications: 11
• 226 With adjustable fluid flow 
  Patents: 28
  Patent Applications: 1
• 227 Pipe-muffler (e.g., tail pipe type) 
  Patents: 157
  Patent Applications: 45
• 228 With exhaust pipe 
  Patents: 152
  Patent Applications: 18
• 229 Carburetor, burner, or compressor intake silencer 
  Patents: 239
  Patent Applications: 22
• 230 Pneumatic type motor (e.g., air hammer, etc.) 
  Patents: 192
  Patent Applications: 12
• 231 With solid particle separator (e.g., spark arrestor, vacuum cleaner, etc.) 
  Patents: 119
  Patent Applications: 11
• 232 Separate distinct units serially connected 
  Patents: 65
  Patent Applications: 6
• 233 Liquid motion silencer 
  Patents: 66
  Patent Applications: 5
• 234 Water-closet type 
  Patents: 14
  Patent Applications: 1
• 235 Underwater discharge 
  Patents: 44
  Patent Applications: 2
• 236 With muffler cut-out 
  Patents: 21
  Patent Applications: 8
• 237 With pressure relief safety valve 
  Patents: 61
  Patent Applications: 22
• 238 Multiple distinct inlets and/or outlets 
  Patents: 79
  Patent Applications: 9
• 239 Outlets 
  Patents: 86
  Patent Applications: 4
• 240 Manifold type 
  Patents: 128
  Patent Applications: 7
• 241 Adjustable muffler (i.e., internal or external parts) 
  Patents: 77
  Patent Applications: 10
• 242 Mouthpiece (e.g., telephone, microphone, etc.) 
  Patents: 32
  Patent Applications: 1
• 243 With repair, replacement, or quick disassembly 
  Patents: 146
  Patent Applications: 3
• 244 Corrosion prevention 
  Patents: 27
  Patent Applications: 0
• 245 Internally coated parts 
  Patents: 9
  Patent Applications: 0
• 246 Nonmetallic 
  Patents: 19
  Patent Applications: 1
• 247 Straight-through passage 
  Patents: 43
  Patent Applications: 7
• 248 Continuous conduit 
  Patents: 50
  Patent Applications: 3
• 249 With expansion chamber 
  Patents: 117
  Patent Applications: 31
• 250 And side branch 
  Patents: 125
  Patent Applications: 36
• 251 And multi-passage 
  Patents: 51
  Patent Applications: 15
• 252 With sound absorbing material 
  Patents: 242
  Patent Applications: 35
• 253 With muffler bypass 
  Patents: 30
  Patent Applications: 8
• 254 Valve controlled 
  Patents: 85
  Patent Applications: 15
• 255 Expansion chamber 
  Patents: 178
  Patent Applications: 17
• 256 With sound absorbing material 
  Patents: 216
  Patent Applications: 43
• 257 And multi-passage 
  Patents: 61
  Patent Applications: 4
• 258 Pervious material interposed in flow path 
  Patents: 166
  Patent Applications: 12
• 259 With disparate fluid mingling 
  Patents: 23
  Patent Applications: 5
• 260 Liquid 
  Patents: 25
  Patent Applications: 0
• 261 Sprayed 
  Patents: 11
  Patent Applications: 0
• 262 Induced by suction 
  Patents: 59
  Patent Applications: 9
• 263 Motion induced 
  Patents: 21
  Patent Applications: 0
• 264 With baffle or baffle structure 
  Patents: 185
  Patent Applications: 22
• 265 Retroverted 
  Patents: 165
  Patent Applications: 4
• 266 And side branch chamber 
  Patents: 68
  Patent Applications: 7
• 267 Coaxial foraminous walls 
  Patents: 42
  Patent Applications: 0
• 268 Multi-passage 
  Patents: 154
  Patent Applications: 14
• 269 Expansion chamber type 
  Patents: 143
  Patent Applications: 25
• 270 With alternating partial baffles along the length of casing 
  Patents: 46
  Patent Applications: 14
• 271 With adjustable or flexible wall 
  Patents: 23
  Patent Applications: 7
• 272 Plural chambers 
  Patents: 381
  Patent Applications: 21
• 273 And side branch chamber 
  Patents: 79
  Patent Applications: 17
• 274 With centrifugal flow 
  Patents: 22
  Patent Applications: 0
• 275 And multi-passage 
  Patents: 87
  Patent Applications: 6
• 276 Side branch 
  Patents: 70
  Patent Applications: 19
• 277 Movable baffle 
  Patents: 42
  Patent Applications: 7
• 278 Biased 
  Patents: 22
  Patent Applications: 4
• 279 Spiral 
  Patents: 53
  Patent Applications: 14
• 280 Helical 
  Patents: 57
  Patent Applications: 3
• 281 Perpendicular and/or oblique 
  Patents: 63
  Patent Applications: 2
• 282 Casings 
  Patents: 239
  Patent Applications: 12
• 283 Air or liquid cooled 
  Patents: 29
  Patent Applications: 2
• 284 Sound absorbing panels 
  Patents: 193
  Patent Applications: 20
• 285 Load bearing block type structure 
  Patents: 51
  Patent Applications: 12
• 286 Specific acoustical properties or dimensions 
  Patents: 355
  Patent Applications: 52
• 287 Movable/foldable panels 
  Patents: 79
  Patent Applications: 9
• 288 Cellular 
  Patents: 150
  Patent Applications: 9
• 289 Light permeable 
  Patents: 28
  Patent Applications: 1
• 290 Multilayer panel or wall structure 
  Patents: 477
  Patent Applications: 113
• 291 With membrane outer layer 
  Patents: 107
  Patent Applications: 2
• 292 With perforated or porous face and honeycomb-like core 
  Patents: 242
  Patent Applications: 19
• 293 With channels or cavities in surface layer 
  Patents: 144
  Patent Applications: 36
• 294 Materials 
  Patents: 304
  Patent Applications: 46
• 295 Space absorbers 
  Patents: 131
  Patent Applications: 7
• 296 Methods 
  Patents: 139
  Patent Applications: 17
• 400 WAVE COUPLING 
  Patents: 19
  Patent Applications: 0
• 401 Earth 
  Patents: 160
  Patent Applications: 0
• 402 Liquid 
  Patents: 47
  Patent Applications: 0
• 403 REFRIGERATOR COMPRESSSOR MUFFLER 
  Patents: 166
  Patent Applications: 1
• 404 HOBBY CRAFT ENGINE MUFFLER 
  Patents: 3
  Patent Applications: 0