US Patent Class 181
ACOUSTICS



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Current as of: June, 1999
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Products
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Services

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