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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

23
181/127

Dentiphone

5
181/128

Ear and mouth

20
181/130

Auditory canal insert

168
181/133

Deflector type

7
181/135

Ear insert

224
181/134

Eardrum

10
181/131

Stethoscope

193
181/132

With diaphragm

17
181/136

Deflector type

26
181/129

Ear

194
181/137

Receiver

76
181/30

Auditorium

60
181/141

Combined

142
181/148

Diaphragm and enclosure

191
181/154

Inclined diaphragm

58
181/149

Moisture proof

40
181/150

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

216
181/155

Reflector baffle

194
181/156

Reflex baffle

283
181/153

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

165
181/152

With horn

172
181/151

With sound-absorbing means

140
181/157

Diaphragm

59
181/167

Critically defined material or coating

105
181/169

Fibrous material

71
181/170

Laminated type

81
181/168

Metallic material

32
181/158

Microphone type

55
181/171

Mounting or suspension means

201
181/172

Elastic suspension means

128
181/173

Particular shape

104
181/174

Variable thickness

29
181/163

Plural dependent diaphragms

73
181/164

Sectional diaphragm

31
181/165

Concentric annular section

24
181/166

With damping means

84
181/161

With direct mechanical connection to drive unit

34
181/162

Stylus bar

1
181/159

With horn

86
181/160

With resonant chamber

92
181/123

Echo system

9
181/124

Altitude or depth detection

40
181/101

Geophysical or subsurface exploration

36
181/107

Programmed or timer-controlled

36
181/108

Seismic source and detector

96
181/109

Aerial

4
181/112

Plural detectors

120
181/111

Plural sources

71
181/110

Underwater

142
181/122

Seismic wave detection

139
181/113

Seismic wave generation

150
181/115

Bubble suppression or control

49
181/116

Explosive

69
181/117

Gas

40
181/118

Underwater

87
181/119

Fluid means

119
181/120

Underwater

221
181/121

Moving weight

169
181/114

Vehicle-mounted

135
181/102

Well logging

230
181/105

Bore hole or casing condition

159
181/104

Directional source or detector

98
181/103

Programmed or timer-controlled

40
181/106

Seismic wave generation

235
181/404

Hobby craft engine muffler

4
181/138

Mechanical telephone

6
181/.5

Miscellaneous

96
181/143

Moving sound producer or deflector

12
181/144

Plural diaphragm sound sources

231
181/145

Plural chambers

139
181/147

Three diaphragms

82
181/146

With sound-asborbing means

70
181/403

Refrigerator compresssor muffler

169
181/125

Sound location

8
181/175

Sound-modifying means

135
181/206

By wave interference

120
181/211

Combined

62
181/198

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

116
181/200

Machine type enclosure

105
181/202

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

107
181/204

Internal-combustion engine

204
181/201

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

22
181/205

Partial enclosure or shroud

50
181/203

Reaction engine test chamber

9
181/199

Speaker type

505
181/177

Intensifying horn

39
181/178

Collapsible

13
181/184

Having apertures in walls

27
181/180

Material

12
181/189

Multisection housing

22
181/190

Separable

16
181/192

Particular shape of the horn

60
181/194

Doubly folded sound path

17
181/193

Spiral sound path

7
181/195

Wide angle annular outlet

18
181/187

Plural intensifying portions

43
181/188

Similar portions

20
181/191

With external sound deflector

33
181/179

With particular mounting structure

28
181/182

With resonant chamber

36
181/183

Double wall

3
181/185

With sound-path restriction

36
181/186

Adjustable

9
181/181

With vibratory filaments

2
181/176

Lens

45
181/207

Mechanical vibration attenuator

191
181/208

Damping of flexural structure

132
181/209

Relatively moving parts

48
181/296

Methods

130
181/212

Muffler, fluid conducting type

74
181/241

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

69
181/229

Carburetor, burner, or compressor intake silencer

229
181/244

Corrosion prevention

20
181/245

Internally coated parts

8
181/246

Nonmetallic

18
181/233

Liquid motion silencer

51
181/234

Water-closet type

13
181/240

Manifold type

114
181/242

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

28
181/238

Multiple distinct inlets and/or outlets

77
181/239

Outlets

77
181/227

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

138
181/230

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

165
181/213

Reaction engine type

150
181/218

Ground installation silencer

24
181/217

Removable silencer unit (e.g., mobile)

21
181/214

Upstream (e.g., intake silencer)

80
181/219

With adjustable internal baffles

21
181/215

With adjustable outlet nozzle

29
181/216

Longitudinally adjustable section

13
181/220

With disparate fluid mingling

94
181/221

Liquid

17
181/222

With sound absorbing material

95
181/232

Separate distinct units serially connected

51
181/223

Silencer for firearms

44
181/224

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

224
181/247

Straight-through passage

40
181/248

Continuous conduit

42
181/249

With expansion chamber

113
181/251

And multi-passage

48
181/250

And side branch

114
181/255

Expansion chamber

165
181/253

With muffler bypass

33
181/254

Valve controlled

83
181/252

With sound absorbing material

224
181/235

Underwater discharge

38
181/226

With adjustable fluid flow

25
181/264

With baffle or baffle structure

169
181/282

Casings

223
181/283

Air or liquid cooled

27
181/267

Coaxial foraminous walls

36
181/269

Expansion chamber type

134
181/275

And multi-passage

87
181/273

And side branch chamber

86
181/272

Plural chambers

374
181/271

With adjustable or flexible wall

26
181/270

With alternating partial baffles along the length of casing

43
181/274

With centrifugal flow

19
181/277

Movable baffle

42
181/278

Biased

25
181/268

Multi-passage

149
181/281

Perpendicular and/or oblique

62
181/265

Retroverted

144
181/266

And side branch chamber

60
181/276

Side branch

75
181/279

Spiral

52
181/280

Helical

47
181/259

With disparate fluid mingling

21
181/262

Induced by suction

49
181/263

Motion induced

19
181/260

Liquid

25
181/261

Sprayed

11
181/228

With exhaust pipe

140
181/225

With fan to assist fluid flow

92
181/236

With muffler cut-out

19
181/237

With pressure relief safety valve

58
181/243

With repair, replacement, or quick disassembly

130
181/231

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

107
181/256

With sound absorbing material

202
181/257

And multi-passage

59
181/258

Pervious material interposed in flow path

160
181/210

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

153
181/284

Sound absorbing panels

191
181/288

Cellular

148
181/289

Light permeable

27
181/285

Load bearing block type structure

50
181/294

Materials

303
181/287

Movable/foldable panels

75
181/290

Multilayer panel or wall structure

445
181/291

With membrane outer layer

103
181/292

With perforated or porous face and honeycomb-like core

220
181/286

Specific acoustical properties or dimensions

337
181/293

With channels or cavities in surface layer

147
181/295

Space absorbers

121
181/196

Within tubular means

39
181/197

Adjustable

8
 

Speaking tubes

 
181/19

Alarms and indicators

5
181/20

Combined mouth and ear pieces

12
181/21

Mouthpieces

16
181/18

Systems

12
181/22

Tubes

15
181/400

Wave coupling

19
181/401

Earth

159
181/402

Liquid

47
181/139

Wave generation and detection

25
181/142

Wave generation

50
181/140

With vessel

16
 
 
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