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Class Information
Number: 181
Name: Acoustics >
Description: This class includes devices and corresponding methods for mechanically transmitting, for amplifying and for ascertaining the direction of sound and for mechanically muffling or filtering sound, and not elsewhere provided for.










Class Number Class Name No. of Patents
181/126

Anatomic or prosthetic relation

27
181/127

Dentiphone

5
181/128

Ear and mouth

30
181/130

Auditory canal insert

247
181/133

Deflector type

12
181/135

Ear insert

327
181/134

Eardrum

13
181/131

Stethoscope

231
181/132

With diaphragm

20
181/136

Deflector type

29
181/129

Ear

263
181/137

Receiver

81
181/30

Auditorium

74
181/141

Combined

150
181/148

Diaphragm and enclosure

256
181/154

Inclined diaphragm

60
181/149

Moisture proof

53
181/150

Recessed (e.g., wall-mounted, etc.)

276
181/155

Reflector baffle

214
181/156

Reflex baffle

318
181/153

Rounded enclosure (e.g., curved, etc.)

182
181/152

With horn

210
181/151

With sound-absorbing means

162
181/157

Diaphragm

75
181/167

Critically defined material or coating

151
181/169

Fibrous material

89
181/170

Laminated type

98
181/168

Metallic material

39
181/158

Microphone type

61
181/171

Mounting or suspension means

248
181/172

Elastic suspension means

160
181/173

Particular shape

126
181/174

Variable thickness

36
181/163

Plural dependent diaphragms

84
181/164

Sectional diaphragm

37
181/165

Concentric annular section

29
181/166

With damping means

96
181/161

With direct mechanical connection to drive unit

41
181/162

Stylus bar

2
181/159

With horn

92
181/160

With resonant chamber

98
181/123

Echo system

10
181/124

Altitude or depth detection

42
181/101

Geophysical or subsurface exploration

51
181/107

Programmed or timer-controlled

38
181/108

Seismic source and detector

109
181/109

Aerial

4
181/112

Plural detectors

130
181/111

Plural sources

84
181/110

Underwater

161
181/122

Seismic wave detection

151
181/113

Seismic wave generation

177
181/115

Bubble suppression or control

51
181/116

Explosive

71
181/117

Gas

48
181/118

Underwater

104
181/119

Fluid means

127
181/120

Underwater

244
181/121

Moving weight

189
181/114

Vehicle-mounted

148
181/102

Well logging

263
181/105

Bore hole or casing condition

178
181/104

Directional source or detector

112
181/103

Programmed or timer-controlled

42
181/106

Seismic wave generation

254
181/404

Hobby craft engine muffler

5
181/138

Mechanical telephone

6
181/.5

Miscellaneous

98
181/143

Moving sound producer or deflector

13
181/144

Plural diaphragm sound sources

254
181/145

Plural chambers

163
181/147

Three diaphragms

92
181/146

With sound-asborbing means

77
181/403

Refrigerator compresssor muffler

195
181/125

Sound location

17
181/175

Sound-modifying means

160
181/206

By wave interference

157
181/211

Combined

81
181/198

Housing or enclosure (e.g., sound confining and absorbing)

168
181/200

Machine type enclosure

144
181/202

Electical type devices (e.g., transformers, motors, etc.)

129
181/204

Internal-combustion engine

247
181/201

Offfice type devices (e.g., typewriters, teleprinters, etc.)

29
181/205

Partial enclosure or shroud

70
181/203

Reaction engine test chamber

13
181/199

Speaker type

590
181/177

Intensifying horn

49
181/178

Collapsible

17
181/184

Having apertures in walls

30
181/180

Material

14
181/189

Multisection housing

24
181/190

Separable

16
181/192

Particular shape of the horn

74
181/194

Doubly folded sound path

21
181/193

Spiral sound path

10
181/195

Wide angle annular outlet

18
181/187

Plural intensifying portions

48
181/188

Similar portions

22
181/191

With external sound deflector

40
181/179

With particular mounting structure

35
181/182

With resonant chamber

39
181/183

Double wall

4
181/185

With sound-path restriction

43
181/186

Adjustable

11
181/181

With vibratory filaments

3
181/176

Lens

63
181/207

Mechanical vibration attenuator

254
181/208

Damping of flexural structure

161
181/209

Relatively moving parts

61
181/296

Methods

158
181/212

Muffler, fluid conducting type

173
181/241

Adjustable muffler (i.e., internal or external parts)

94
181/229

Carburetor, burner, or compressor intake silencer

296
181/244

Corrosion prevention

22
181/245

Internally coated parts

8
181/246

Nonmetallic

29
181/233

Liquid motion silencer

60
181/234

Water-closet type

15
181/240

Manifold type

139
181/242

Mouthpiece (e.g., telephone, microphone, etc.)

29
181/238

Multiple distinct inlets and/or outlets

96
181/239

Outlets

97
181/227

Pipe-muffler (e.g., tail pipe type)

221
181/230

Pneumatic type motor (e.g., air hammer, etc.)

184
181/213

Reaction engine type

219
181/218

Ground installation silencer

29
181/217

Removable silencer unit (e.g., mobile)

23
181/214

Upstream (e.g., intake silencer)

130
181/219

With adjustable internal baffles

27
181/215

With adjustable outlet nozzle

38
181/216

Longitudinally adjustable section

21
181/220

With disparate fluid mingling

113
181/221

Liquid

19
181/222

With sound absorbing material

114
181/232

Separate distinct units serially connected

64
181/223

Silencer for firearms

93
181/224

Sound absorbing ventilating duct or curb (e.g., a/c, heat, air flow type)

299
181/247

Straight-through passage

56
181/248

Continuous conduit

54
181/249

With expansion chamber

150
181/251

And multi-passage

75
181/250

And side branch

171
181/255

Expansion chamber

181
181/253

With muffler bypass

44
181/254

Valve controlled

124
181/252

With sound absorbing material

279
181/235

Underwater discharge

45
181/226

With adjustable fluid flow

27
181/264

With baffle or baffle structure

209
181/282

Casings

256
181/283

Air or liquid cooled

39
181/267

Coaxial foraminous walls

44
181/269

Expansion chamber type

156
181/275

And multi-passage

107
181/273

And side branch chamber

99
181/272

Plural chambers

420
181/271

With adjustable or flexible wall

36
181/270

With alternating partial baffles along the length of casing

60
181/274

With centrifugal flow

31
181/277

Movable baffle

47
181/278

Biased

29
181/268

Multi-passage

179
181/281

Perpendicular and/or oblique

74
181/265

Retroverted

154
181/266

And side branch chamber

71
181/276

Side branch

93
181/279

Spiral

63
181/280

Helical

55
181/259

With disparate fluid mingling

25
181/262

Induced by suction

60
181/263

Motion induced

21
181/260

Liquid

27
181/261

Sprayed

13
181/228

With exhaust pipe

221
181/225

With fan to assist fluid flow

127
181/236

With muffler cut-out

20
181/237

With pressure relief safety valve

90
181/243

With repair, replacement, or quick disassembly

142
181/231

With solid particle separator (e.g., spark arrestor, vacuum cleaner, etc.)

121
181/256

With sound absorbing material

253
181/257

And multi-passage

76
181/258

Pervious material interposed in flow path

185
181/210

Sound absorbing fence or screen (e.g., jet engine or vehicle noise)

217
181/284

Sound absorbing panels

285
181/288

Cellular

169
181/289

Light permeable

33
181/285

Load bearing block type structure

64
181/294

Materials

372
181/287

Movable/foldable panels

92
181/290

Multilayer panel or wall structure

593
181/291

With membrane outer layer

117
181/292

With perforated or porous face and honeycomb-like core

294
181/286

Specific acoustical properties or dimensions

432
181/293

With channels or cavities in surface layer

185
181/295

Space absorbers

140
181/196

Within tubular means

52
181/197

Adjustable

12
 

Speaking tubes

 
181/19

Alarms and indicators

5
181/20

Combined mouth and ear pieces

13
181/21

Mouthpieces

17
181/18

Systems

12
181/22

Tubes

17
181/400

Wave coupling

19
181/401

Earth

163
181/402

Liquid

47
181/139

Wave generation and detection

30
181/142

Wave generation

62
181/140

With vessel

16
 
 
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